Error paver update_db

[David LM]

I install the first version of eucalyptus and I change some things to add a new repository. When I enter the command 'paver update_db' the terminal return this:

---> pavelib.servers.update_db

---> pavelib.prereqs.install_prereqs

---> pavelib.prereqs.install_node_prereqs

Node prereqs unchanged, skipping...

---> pavelib.prereqs.install_python_prereqs

Python uninstalls unchanged, skipping...

Python prereqs unchanged, skipping...

python manage.py lms --settings=devstack migrate --traceback --pythonpath=.

Traceback (most recent call last):

  File "manage.py", line 112, in <module>

    startup.run()

  File "/edx/app/edxapp/edx-platform/lms/startup.py", line 50, in run

    django.setup()

  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup

    apps.populate(settings.INSTALLED_APPS)

  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/apps/registry.py", line 115, in populate

    app_config.ready()

  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/contrib/admin/apps.py", line 22, in ready

    self.module.autodiscover()

  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/contrib/admin/__init__.py", line 24, in autodiscover

    autodiscover_modules('admin', register_to=site)

  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/module_loading.py", line 74, in autodiscover_modules

    import_module('%s.%s' % (app_config.name, module_to_search))

  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module

    __import__(name)

  File "/edx/app/edxapp/edx-platform/common/djangoapps/django_comment_common/admin.py", line 6, in <module>

ImportError: cannot import name ForumsConfig

Captured Task Output:

---------------------

---> pavelib.servers.update_db

---> pavelib.prereqs.install_prereqs

---> pavelib.prereqs.install_node_prereqs

---> pavelib.prereqs.install_python_prereqs

python manage.py lms --settings=devstack migrate --traceback --pythonpath=.

Build failed running pavelib.servers.update_db: Subprocess return code: 1

Any idea to fix the problem?

Thanks