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AttributeError in final version of Django Authentication (msg) project when I click on username.

When I try to run the final version (downloaded from teacher's notes) of the msg app in Workspaces, I'm getting an AttributeError (Manager isn't available; 'auth.User' has been swapped for 'accounts.User') when I click on someone's username. There's no error in earlier versions of the project. I've googled the error and read through docs but can't figure out a solution. Anyone have an idea of what's going on?

AttributeError at /posts/by/kennethlove/ Manager isn't available; 'auth.User' has been swapped for 'accounts.User' Request Method: GET Request URL: http://port-8000-7foqfudzp7.treehouse-app.com/posts/by/kennethlove/ Django Version: 1.9.9 Exception Type: AttributeError Exception Value:
Manager isn't available; 'auth.User' has been swapped for 'accounts.User' Exception Location: /usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/db/models/manager.py in get, line 277 Python Executable: /usr/local/pyenv/versions/3.5.0/bin/python Python Version: 3.5.0 Python Path:
['/home/treehouse/workspace/msg', '/usr/local/pyenv/versions/3.5.0/lib/python35.zip', '/usr/local/pyenv/versions/3.5.0/lib/python3.5', '/usr/local/pyenv/versions/3.5.0/lib/python3.5/plat-linux', '/usr/local/pyenv/versions/3.5.0/lib/python3.5/lib-dynload', '/usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages'] Server time: Tue, 5 Sep 2017 21:19:43 +0000 Traceback Switch to copy-and-paste view

/usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/core/handlers/base.py in get_response response = self.process_exception_by_middleware(e, request) ... ▶ Local vars /usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/core/handlers/base.py in get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ... ▶ Local vars /usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/views/generic/base.py in view return self.dispatch(request, *args, **kwargs) ... ▶ Local vars /usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/views/generic/base.py in dispatch return handler(request, *args, **kwargs) ... ▶ Local vars /usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/views/generic/list.py in get self.object_list = self.get_queryset() ... ▶ Local vars /home/treehouse/workspace/msg/posts/views.py in get_queryset self.post_user = User.objects.prefetch_related("posts").get( ... ▶ Local vars /usr/local/pyenv/versions/3.5.0/lib/python3.5/site-packages/django/db/models/manager.py in get self.model._meta.swapped, ... ▶ Local vars