TeamCalendarPlugin works partially

[gmanukya@…]

Hi,

I have instaleld TeamCalendarPlugin and edited the trac.db with sqlite3 as instructed. The new tab "Team Calendar" showed up on the top right corner as promised.

When I go there and select the dates for users then I click "Apply Changes" button I get the following error message:

Most recent call last:

File "/usr/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/web/main.py", line 511, in _dispatch_request
  dispatcher.dispatch(req)
File "/usr/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/web/main.py", line 237, in dispatch
  resp = chosen_handler.process_request(req)
File "/usr/lib/python2.6/site-packages/teamcalendar-0.1-py2.6.egg/teamcalendar/calendar.py", line 246, in process_request
  self.update_timetable(tuples)
File "/usr/lib/python2.6/site-packages/teamcalendar-0.1-py2.6.egg/teamcalendar/calendar.py", line 168, in update_timetable
  flat)
File "/usr/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/db/util.py", line 65, in execute
  return self.cursor.execute(sql_escape_percent(sql), args)
File "/usr/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/db/sqlite_backend.py", line 78, in execute
  result = PyFormatCursor.execute(self, *args)
File "/usr/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/db/sqlite_backend.py", line 56, in execute
  args or [])
File "/usr/lib/python2.6/site-packages/Trac-0.12.2-py2.6.egg/trac/db/sqlite_backend.py", line 48, in _rollback_on_error
  return function(self, *args, **kwargs)

Here is some info about the system:
Trac 	0.12.2
Babel 	0.9.4
Docutils 	0.6
Genshi 	0.6
Pygments 	1.1.1
pysqlite 	2.6.3
Python 	2.6.6 (r266:84292, Dec 7 2011, 20:38:36) [GCC 4.4.6 20110731 (Red Hat 4.4.6-3)]
pytz 	2010h
setuptools 	0.6
SQLite 	3.6.20
Subversion 	1.6.11 (r934486)
jQuery:	1.4.2

Installed Plugins:

Default-CC 	0.1 	/usr/lib/python2.6/site-packages/Default_CC-0.1-py2.6.egg
teamcalendar 	0.1 	/usr/lib/python2.6/site-packages/teamcalendar-0.1-py2.6.egg
TracPrivateTickets 	2.0.3 	/usr/lib/python2.6/site-packages/TracPrivateTickets-2.0.3-py2.6.egg
TracTicketDelete 	2.0.1 	/usr/lib/python2.6/site-packages/TracTicketDelete-2.0.1-py2.6.egg