/home/prayashm/workbench/tryton-repo/env/local/lib/python2.7/site-packages/relatorio/templates/__init__.py:29: UserWarning: Unable to load plugin 'chart'
  warnings.warn("Unable to load plugin '%s'" % name)
Traceback (most recent call last):
  File "bin/trytond", line 17, in <module>
    from trytond.application import app
  File "/home/prayashm/workbench/tryton-repo/trytond/trytond/application.py", line 8, in <module>
    Pool.start()
  File "/home/prayashm/workbench/tryton-repo/trytond/trytond/pool.py", line 97, in start
    register_classes()
  File "/home/prayashm/workbench/tryton-repo/trytond/trytond/modules/__init__.py", line 362, in register_classes
    mod_file, pathname, description)
  File "/home/prayashm/workbench/tryton-repo/trytond/trytond/modules/calendar/__init__.py", line 5, in <module>
    from . import caldav
  File "/home/prayashm/workbench/tryton-repo/trytond/trytond/modules/calendar/caldav.py", line 11, in <module>
    from trytond.modules.webdav.protocol import TrytonDAVInterface, LOCAL, \
  File "/home/prayashm/workbench/tryton-repo/trytond/trytond/modules/webdav/protocol.py", line 26, in <module>
    from trytond.exceptions import UserError, UserWarning, NotLogged, \
ImportError: cannot import name NotLogged