Thank you for reporting this bug to Ubuntu.
Ubuntu GNOME 16.04 (xenial) reached end-of-life in April 2019.

https://ubuntugnome.org/ubuntu-gnome-16-04-lts-is-here/
https://wiki.ubuntu.com/XenialXerus/ReleaseNotes/UbuntuGNOME

We appreciate that this bug may be old and you might not be interested
in discussing it any more. But if you are then please upgrade to the
latest Ubuntu version and re-test. If you then find the bug is still
present in the newer Ubuntu version, please add a comment here telling
us which new version it is in.

** Changed in: gnome-shell (Ubuntu)
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1618910

Title:
  (gnome-shell:4131): Clutter-CRITICAL **:
  clutter_layout_manager_get_child_meta: assertion
  'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed

Status in gnome-shell package in Ubuntu:
  Won't Fix

Bug description:
  chris@localhost:~$ lsb_release -crid
  Distributor ID:       Ubuntu
  Description:  Ubuntu 16.04.1 LTS
  Release:      16.04
  Codename:     xenial

  chris@localhost:~$ apt-cache policy gnome-shell
  gnome-shell:
    Installed: 3.18.5-0ubuntu0.1
    Candidate: 3.18.5-0ubuntu0.1
    Version table:
   *** 3.18.5-0ubuntu0.1 500
          500 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 
Packages
          100 /var/lib/dpkg/status
       3.18.4-0ubuntu3 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages

  
  Below is one seconds output to the syslog whenever Cairo-Dock is running

  chris@localhost:~$ apt-cache policy cairo-dock
  cairo-dock:
    Installed: 3.4.1-0ubuntu1
    Candidate: 3.4.1-0ubuntu1
    Version table:
   *** 3.4.1-0ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
          500 http://us.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
          100 /var/lib/dpkg/status

  
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  Aug 31 08:47:27 localhost gnome-session[3997]: (gnome-shell:4131): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed

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