If i run KCacheGrind i have this error, when try generate pdf graph

======================='" 
CallGraphView::refresh 
CallGraphView::refresh: Starting process 0x237b6f0, 'dot -Tplain'
CallGraphView::readDotOutput: QProcess 0x237b6f0
CallGraphView::readDotOutput: QProcess 0x237b6f0
CallGraphView::readDotOutput: QProcess 0x237b6f0
CallGraphView::dotExited: QProcess 0x237b6f0
undefined -21
undefined -21

(evince:20545): EvinceDocument-CRITICAL **:
ev_document_misc_pixbuf_from_surface: assertion `surface' failed

(evince:20545): GLib-GObject-CRITICAL **: g_object_unref: assertion 
`G_IS_OBJECT (object)' failed
undefined -21

(evince:20545): EvinceDocument-CRITICAL **:
ev_document_misc_pixbuf_from_surface: assertion `surface' failed

(evince:20545): GLib-GObject-CRITICAL **: g_object_unref: assertion 
`G_IS_OBJECT (object)' failed
undefined -21

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https://bugs.launchpad.net/bugs/270744

Title:
  GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT
  (object)' failed

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