I'm trying to do a trac-admin /path/to/trac upgrade on my trac
database and i'm receiving an error: AttributeError: Cursor instance
has no attribute 'connection'.

The full error I'm receiving is below.  I know I have the path to trac
correct and I can do other trac-admin commands.  Any ideas?

trac-admin /srv/trac upgrade
Traceback (most recent call last):
  File "/usr/local/bin/trac-admin", line 8, in <module>
    load_entry_point('Trac==0.11.5', 'console_scripts', 'trac-admin')
()
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/
trac/admin/console.py", line 1314, in run
    return admin.onecmd(command)
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/
trac/admin/console.py", line 133, in onecmd
    rv = cmd.Cmd.onecmd(self, line) or 0
  File "/usr/lib/python2.6/cmd.py", line 219, in onecmd
    return func(arg)
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/
trac/admin/console.py", line 1149, in do_upgrade
    if not self.__env.needs_upgrade():
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/
trac/env.py", line 429, in needs_upgrade
    if participant.environment_needs_upgrade(db):
  File "/usr/local/lib/python2.6/dist-packages/TracBurndown-1.9.1-
py2.6.egg/burndown/burndown.py", line 56, in
environment_needs_upgrad                      e
    if dbhelper.table_field_exists(db, "burndown", "week"):
  File "/usr/local/lib/python2.6/dist-packages/TracBurndown-1.9.1-
py2.6.egg/burndown/dbhelper.py", line 86, in table_field_exists
    cursor.connection.rollback()
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/
trac/db/util.py", line 38, in __getattr__
    return getattr(self.cursor, name)
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/
trac/db/util.py", line 38, in __getattr__
    return getattr(self.cursor, name)
AttributeError: Cursor instance has no attribute 'connection'

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