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error after migration to python3.6

Environment:


Request Method: GET
Request URL: http://localhost:8000/visit/mark/1/finished

Django Version: 2.0.13
Python Version: 3.6.12
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django_cleanup',
 'django_cron',
 'django_otp',
 'django_otp.plugins.otp_static',
 'django_otp.plugins.otp_totp',
 'two_factor',
 'web',
 'stronghold',
 'debug_toolbar']
Installed Middleware:
['debug_toolbar.middleware.DebugToolbarMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django_otp.middleware.OTPMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'stronghold.middleware.LoginRequiredMiddleware']



Traceback:

File "/home/gawi/workspace/scheduling-system/env/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  35.             response = get_response(request)

File "/home/gawi/workspace/scheduling-system/env/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  128.                 response = self.process_exception_by_middleware(e, request)

File "/home/gawi/workspace/scheduling-system/env/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  126.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/gawi/workspace/scheduling-system/smash/web/views/visit.py" in visit_mark
  125.         visit.mark_as_finished()

File "/home/gawi/workspace/scheduling-system/smash/web/models/visit.py" in mark_as_finished
  99.             time_to_next_visit = relativedelta(**args) * (follow_up_number - 1) #calculated from first visit

Exception Type: TypeError at /visit/mark/1/finished
Exception Value: __init__() got an unexpected keyword argument 'b'years''

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