An internal server error has occurred. This most likely means that you have found a bug in SchoolTool. Please report it on the issue tracker.

Exception
ComponentLookupError: (<InterfaceClass schooltool.app.interfaces.ISchoolToolAuthenticationPlugin>, '')

Traceback
File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 129, in publish
  obj = request.traverse(obj)
File "/usr/lib/python2.7/dist-packages/zope/publisher/browser.py", line 540, in traverse
  ob = super(BrowserRequest, self).traverse(obj)
File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 457, in traverse
  ob = super(HTTPRequest, self).traverse(obj)
File "/usr/lib/python2.7/dist-packages/zope/publisher/base.py", line 249, in traverse
  publication.callTraversalHooks(self, obj)
File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 135, in callTraversalHooks
  self._maybePlacefullyAuthenticate(request, ob)
File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 122, in _maybePlacefullyAuthenticate
  principal = auth.authenticate(request)
File "/usr/lib/python2.7/dist-packages/schooltool/app/security.py", line 220, in authenticate
  return self.authPlugin.authenticate(request)
File "/usr/lib/python2.7/dist-packages/schooltool/app/security.py", line 217, in authPlugin
  return getUtility(ISchoolToolAuthenticationPlugin)
File "/usr/lib/python2.7/dist-packages/zope/component/_api.py", line 169, in getUtility
  raise ComponentLookupError(interface, name)


Modules
schooltool 2.8.3 (/usr/lib/python2.7/dist-packages)

schooltool.cando 2.8.2 (/usr/lib/python2.7/dist-packages)

schooltool.cas 0.4.2 (/usr/lib/python2.7/dist-packages)

schooltool.gradebook 2.8.3.1 (/usr/lib/python2.7/dist-packages)

schooltool.intervention 2.7.0 (/usr/lib/python2.7/dist-packages)

schooltool.lyceum.journal 2.8.2.1 (/usr/lib/python2.7/dist-packages)

Runtime
Python 2.7.6 (default, Mar 22 2014, 22:59:56) [GCC 4.8.2]

Linux elcweb-dev 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64

Filesystem encoding UTF-8, preferred UTF-8