[CrashManager] Clicking "Preview" in Assign Bug crashes

[nth10sd]

However, saving a bug number works, with identical login credentials.

Traceback:

File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/decorators.py" in _wrapped_view
  23.                 return view_func(request, *args, **kwargs)

File "./crashmanager/views.py" in linkSignature
  775.             bugData = provider.getInstance().getBugData(bugId, username, password)

File "./crashmanager/Bugtracker/BugzillaProvider.py" in getBugData
  445.         return bz.getBug(bugId)

File "./crashmanager/Bugtracker/BugzillaREST.py" in getBug
  67.         bugs = self.getBugs([bugId])

File "./crashmanager/Bugtracker/BugzillaREST.py" in getBugs
  85.         if self.login():

File "./crashmanager/Bugtracker/BugzillaREST.py" in login
  61.             raise RuntimeError('Login failed: %s', response.text)

Exception Type: RuntimeError at /crashmanager/signatures/6376/link/
Exception Value: ('Login failed: %s', u'{"documentation":"https://bmo.readthedocs.org/en/latest/api/","error":true,"code":300,"message":"The username or password you entered is not valid."}')

[nth10sd]

... where login credentials refer to using an API key for logging in.