OperationalError: (1054, "Unknown column 'started' in 'field list'")

[roman]

How to Reproduce

While doing a GET operation on /burndown, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'node': <tracflexwiki.core.TracFlexWikiNode instance at 0xb9f1b4cc>}

User Agent was: Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6

System Information

Trac	0.11.5
Python	2.6.2 (release26-maint, Apr 19 2009, 02:11:59) [GCC 4.3.3]
setuptools	0.6c9
MySQL	server: "5.0.75-0ubuntu10.2", client: "5.0.75", thread-safe: 1
MySQLdb	1.2.2
Genshi	0.5.1
mod_python	3.3.1
Pygments	0.10
Subversion	1.5.4 (r33841)
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/trac/web/main.py", line 444, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/trac/web/main.py", line 205, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.macosx-10.6-universal/egg/burndown/burndown.py", line 139, in process_request
    milestones = dbhelper.get_milestones(db)
  File "build/bdist.macosx-10.6-universal/egg/burndown/dbhelper.py", line 56, in get_milestones
    cursor.execute("SELECT name, due, completed, started, description FROM milestone order by name")
  File "/usr/local/lib/python2.6/dist-packages/Trac-0.11.5-py2.6.egg/trac/db/util.py", line 60, in execute
    return self.cursor.execute(sql)
  File "/var/lib/python-support/python2.6/MySQLdb/cursors.py", line 166, in execute
    self.errorhandler(self, exc, value)
  File "/var/lib/python-support/python2.6/MySQLdb/connections.py", line 35, in defaulterrorhandler
    raise errorclass, errorvalue
OperationalError: (1054, "Unknown column 'started' in 'field list'")

[Remy Blank]

PluginIssue (burndown).