Environment:

Software Version: FreeNAS-11.1-U4 (89e3d93bc)
Request Method: POST
Request URL: http://freenas.xxxxxxxxx/storage/volume/4/unlock/?X-Progress-ID=xxxxxxxxxxxxxxx


Traceback:
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  42.             response = get_response(request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  178.             response = middleware_method(request, callback, callback_args, callback_kwargs)
File "./freenasUI/freeadmin/middleware.py" in process_view
  162.         return login_required(view_func)(request, *view_args, **view_kwargs)
File "/usr/local/lib/python3.6/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
  23.                 return view_func(request, *args, **kwargs)
File "./freenasUI/storage/views.py" in volume_unlock
  1033.             form.done(volume=volume)
File "./freenasUI/storage/forms.py" in done
  2822.             raise MiddlewareError(msg)

Exception Type: MiddlewareError at /storage/volume/4/unlock/
Exception Value: [MiddlewareError: Volume could not be imported]