The server starts without problems when I remove my database.

After this I removed the schooltool packages and reinstalled them again. Then I stopped the server and replaced the new database with my original.

The server fails again with the assertion error. "paste.log" says:

----------------
Konfiguration von /etc/schooltool/standard/schooltool.conf einlesen
INFO:zope.app.generations:main db: evolving in mode EVOLVEMINIMUM
INFO:zope.app.generations:main db/schooltool.requirement: running install generation
ERROR:zope.app.generations:main db/schooltool.requirement: failed to run install
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/generations/generations.py", line 450, in evolve
    manager.install(context)
  File "/usr/lib/python2.7/dist-packages/zope/app/generations/generations.py", line 160, in install
    evolver.evolve(context)
  File "/usr/lib/python2.7/dist-packages/schooltool/requirement/generations/install.py", line 30, in evolve
    evolve1.evolve(context)
  File "/usr/lib/python2.7/dist-packages/schooltool/requirement/generations/evolve1.py", line 69, in evolve
    removeUtils(site_manager, ICustomScoreSystem)
  File "/usr/lib/python2.7/dist-packages/schooltool/requirement/generations/evolve1.py", line 48, in removeUtils
    assert n_provided == len(utilities)
AssertionError
Traceback (most recent call last):
  File "/usr/bin/paster", line 4, in <module>
    command.run()
  File "/usr/lib/python2.7/dist-packages/paste/script/command.py", line 104, in run
    invoke(command, command_name, options, args[1:])
  File "/usr/lib/python2.7/dist-packages/paste/script/command.py", line 143, in invoke
    exit_code = runner.run(args)
  File "/usr/lib/python2.7/dist-packages/paste/script/command.py", line 238, in run
    result = self.command()
  File "/usr/lib/python2.7/dist-packages/paste/script/serve.py", line 284, in command
    relative_to=base, global_conf=vars)
  File "/usr/lib/python2.7/dist-packages/paste/script/serve.py", line 321, in loadapp
    **kw)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 272, in loadobj
    return context.create()
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
    return self.object_type.invoke(self)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 146, in invoke
    return fix_call(context.object, context.global_conf, **context.local_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 56, in fix_call
    val = callable(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/schooltool/paste/main.py", line 48, in schooltool_app_factory
    os.path.join(global_conf['here'], config_file))
  File "/usr/lib/python2.7/dist-packages/schooltool/paste/main.py", line 37, in __init__
    db = self.setup(options)
  File "/usr/lib/python2.7/dist-packages/schooltool/app/main.py", line 679, in setup
    notify(DatabaseOpened(db))
  File "/usr/lib/python2.7/dist-packages/zope/event/__init__.py", line 31, in notify
    subscriber(event)
  File "/usr/lib/python2.7/dist-packages/zope/component/event.py", line 24, in dispatch
    zope.component.subscribers(event, None)
  File "/usr/lib/python2.7/dist-packages/zope/component/_api.py", line 136, in subscribers
    return sitemanager.subscribers(objects, interface)
  File "/usr/lib/python2.7/dist-packages/zope/component/registry.py", line 321, in subscribers
    return self.adapters.subscribers(objects, provided)
  File "/usr/lib/python2.7/dist-packages/zope/interface/adapter.py", line 585, in subscribers
    subscription(*objects)
  File "/usr/lib/python2.7/dist-packages/zope/app/appsetup/bootstrap.py", line 175, in bootStrapSubscriber
    zope.event.notify(zope.processlifetime.DatabaseOpenedWithRoot(db))
  File "/usr/lib/python2.7/dist-packages/zope/event/__init__.py", line 31, in notify
    subscriber(event)
  File "/usr/lib/python2.7/dist-packages/zope/component/event.py", line 24, in dispatch
    zope.component.subscribers(event, None)
  File "/usr/lib/python2.7/dist-packages/zope/component/_api.py", line 136, in subscribers
    return sitemanager.subscribers(objects, interface)
  File "/usr/lib/python2.7/dist-packages/zope/component/registry.py", line 321, in subscribers
    return self.adapters.subscribers(objects, provided)
  File "/usr/lib/python2.7/dist-packages/zope/interface/adapter.py", line 585, in subscribers
    subscription(*objects)
  File "/usr/lib/python2.7/dist-packages/zope/app/generations/generations.py", line 521, in evolveMinimumSubscriber
    evolve(event.database, EVOLVEMINIMUM)
  File "/usr/lib/python2.7/dist-packages/zope/app/generations/generations.py", line 450, in evolve
    manager.install(context)
  File "/usr/lib/python2.7/dist-packages/zope/app/generations/generations.py", line 160, in install
    evolver.evolve(context)
  File "/usr/lib/python2.7/dist-packages/schooltool/requirement/generations/install.py", line 30, in evolve
    evolve1.evolve(context)
  File "/usr/lib/python2.7/dist-packages/schooltool/requirement/generations/evolve1.py", line 69, in evolve
    removeUtils(site_manager, ICustomScoreSystem)
  File "/usr/lib/python2.7/dist-packages/schooltool/requirement/generations/evolve1.py", line 48, in removeUtils
    assert n_provided == len(utilities)
AssertionError
--------

Please, help with bringing up my production database.