/api/v1/userstories error

[scheiblr]

I just installed the system according to the docs on a Debian machine.

I used to get ldap work and can login. It's possible to create projects (tried kanban), but I cannot create any userstory.

trace:

Environment:


Request Method: POST
Request URL: https://cci-communication.uniklinik-freiburg.de/api/v1/userstories

Django Version: 1.11.16
Python Version: 3.5.3
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.admin',
 'django.contrib.staticfiles',
 'django.contrib.sitemaps',
 'django.contrib.postgres',
 'taiga.base',
 'taiga.base.api',
 'taiga.locale',
 'taiga.events',
 'taiga.front',
 'taiga.users',
 'taiga.userstorage',
 'taiga.external_apps',
 'taiga.projects',
 'taiga.projects.references',
 'taiga.projects.custom_attributes',
 'taiga.projects.history',
 'taiga.projects.notifications',
 'taiga.projects.attachments',
 'taiga.projects.likes',
 'taiga.projects.votes',
 'taiga.projects.milestones',
 'taiga.projects.epics',
 'taiga.projects.userstories',
 'taiga.projects.tasks',
 'taiga.projects.issues',
 'taiga.projects.wiki',
 'taiga.projects.contact',
 'taiga.projects.settings',
 'taiga.searches',
 'taiga.timeline',
 'taiga.mdrender',
 'taiga.export_import',
 'taiga.feedback',
 'taiga.stats',
 'taiga.hooks.github',
 'taiga.hooks.gitlab',
 'taiga.hooks.bitbucket',
 'taiga.hooks.gogs',
 'taiga.webhooks',
 'taiga.importers',
 'djmail',
 'django_jinja',
 'django_jinja.contrib._humanize',
 'sr',
 'easy_thumbnails',
 'raven.contrib.django.raven_compat',
 'taiga_contrib_ldap_auth_ext']
Installed Middleware:
['raven.contrib.django.middleware.SentryMiddleware',
 'taiga.base.middleware.cors.CoorsMiddleware',
 'taiga.events.middleware.SessionIDMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware']



Traceback:

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/taiga/taiga-back/taiga/base/api/viewsets.py" in view
  106.             return self.dispatch(request, *args, **kwargs)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/views/decorators/csrf.py" in wrapped_view
  58.         return view_func(*args, **kwargs)

File "/home/taiga/taiga-back/taiga/base/api/views.py" in dispatch
  460.             response = self.handle_exception(exc)

File "/home/taiga/taiga-back/taiga/base/api/views.py" in dispatch
  458.             response = handler(request, *args, **kwargs)

File "/usr/lib/python3.5/contextlib.py" in inner
  30.                 return func(*args, **kwds)

File "/home/taiga/taiga-back/taiga/projects/userstories/api.py" in create
  254.         response = super().create(*args, **kwargs)

File "/home/taiga/taiga-back/taiga/base/api/mixins.py" in create
  100.             self.object = validator.save(force_insert=True)

File "/home/taiga/taiga-back/taiga/projects/notifications/mixins.py" in save
  349.         obj = super(EditableWatchedResourceSerializer, self).save(**kwargs)

File "/home/taiga/taiga-back/taiga/base/api/serializers.py" in save
  1116.         self.object = super().save(**kwargs)

File "/home/taiga/taiga-back/taiga/base/api/serializers.py" in save
  649.             self.save_object(self.object, **kwargs)

File "/home/taiga/taiga-back/taiga/base/api/serializers.py" in save_object
  1134.         obj.save(**kwargs)

File "/home/taiga/taiga-back/taiga/projects/userstories/models.py" in save
  132.         super().save(*args, **kwargs)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/db/models/base.py" in save
  808.                        force_update=force_update, update_fields=update_fields)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/db/models/base.py" in save_base
  848.                 update_fields=update_fields, raw=raw, using=using,

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/dispatch/dispatcher.py" in send
  193.             for receiver in self._live_receivers(sender)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/dispatch/dispatcher.py" in <listcomp>
  193.             for receiver in self._live_receivers(sender)

File "/home/taiga/taiga-back/taiga/projects/references/models.py" in attach_sequence
  117.             instance.save(update_fields=['ref'])

File "/home/taiga/taiga-back/taiga/projects/userstories/models.py" in save
  132.         super().save(*args, **kwargs)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/db/models/base.py" in save
  808.                        force_update=force_update, update_fields=update_fields)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/db/models/base.py" in save_base
  848.                 update_fields=update_fields, raw=raw, using=using,

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/dispatch/dispatcher.py" in send
  193.             for receiver in self._live_receivers(sender)

File "/home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/django/dispatch/dispatcher.py" in <listcomp>
  193.             for receiver in self._live_receivers(sender)

File "/home/taiga/taiga-back/taiga/events/signal_handlers.py" in on_save_any_model
  45.     events.emit_event_for_model(instance, sessionid=sesionid, type=type)

File "/home/taiga/taiga-back/taiga/events/events.py" in emit_event_for_model
  92.                       data=data)

File "/home/taiga/taiga-back/taiga/events/events.py" in emit_event
  53.     backend = backends.get_events_backend()

File "/home/taiga/taiga-back/taiga/events/backends/base.py" in get_events_backend
  60.     return cls(**options)

Exception Type: TypeError at /api/v1/userstories
Exception Value: __init__() missing 1 required positional argument: 'url'

pip --version

pip 18.1 from /home/taiga/.virtualenvs/taiga/lib/python3.5/site-packages/pip (python 3.5)

pip freeze

amqp==2.3.2
asana==0.6.7
asn1crypto==0.24.0
billiard==3.5.0.5
bleach==2.1.4
cairocffi==0.9.0
CairoSVG==2.0.3
celery==4.0.2
certifi==2018.11.29
cffi==1.11.5
chardet==3.0.4
contextlib2==0.5.5
cryptography==2.3.1
cssselect==1.0.3
cssutils==1.0.2
diff-match-patch==20121119
Django==1.11.16
django-ipware==1.1.6
django-jinja==2.3.1
django-pglocks==1.0.2
django-picklefield==0.3.2
django-sampledatahelper==0.4.1
django-sites==0.9
django-sr==0.0.4
djmail==1.0.1
docopt==0.6.2
easy-thumbnails==2.4.1
fn==0.4.3
gunicorn==19.7.1
html5lib==1.0.1
idna==2.7
Jinja2==2.10
kombu==4.0.2
ldap3==2.5.2
lxml==4.2.5
Markdown==3.0.1
MarkupSafe==1.1.0
netaddr==0.7.19
oauthlib==2.1.0
olefile==0.46
Pillow==4.1.1
pkg-resources==0.0.0
premailer==3.0.1
psd-tools==1.4
psycopg2-binary==2.7.5
pyasn1==0.4.5
pycparser==2.19
Pygments==2.2.0
PyJWT==1.7.0
python-dateutil==2.7.5
python-magic==0.4.13
pytz==2018.7
raven==6.1.0
redis==2.10.5
requests==2.20.0
requests-oauthlib==0.8.0
sampledata==0.3.7
serpy==0.1.1
six==1.11.0
taiga-contrib-ldap-auth-ext==0.3.4
tinycss==0.4
Unidecode==0.4.20
urllib3==1.24.1
vine==1.1.4
webcolors==1.7
webencodings==0.5.1

[scheiblr]

performed a re-installation and still having the same issue, which makes the application pretty useless :(