TypeError: Cannot create a consistent method resolution

(biscuit) root@plaskebasseng:/usr/src/BiscuIT-ng# ./manage.py migrate
Traceback (most recent call last):
  File "./manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "/srv/biscuit/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/srv/biscuit/lib/python3.7/site-packages/django/core/management/__init__.py", line 357, in execute
    django.setup()
  File "/srv/biscuit/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/srv/biscuit/lib/python3.7/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/srv/biscuit/lib/python3.7/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/srv/biscuit/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/src/BiscuIT-ng/apps/official/BiscuIT-App-Alsijil/biscuit/apps/alsijil/models.py", line 33, in <module>
    class LessonDocumentation(models.Model, CRUDMixin):
  File "/srv/biscuit/lib/python3.7/site-packages/django/db/models/base.py", line 94, in __new__
    new_class = super_new(cls, name, bases, new_attrs, **kwargs)
TypeError: Cannot create a consistent method resolution
order (MRO) for bases Model, CRUDMixin