(Other posts on SO are similar, but none have the specific combination of uwsgi + Flask + virtualenv) (This one is closest)
I installed uwsgi via apt-get. I also tried
The path to your virtual environment is wrong. That's the reason for this error.
I'm using virtualenvwrapper and my virtual environments are set at ~/.virtualenvs. So in my case, the uwsgi call would look something like
sudo uwsgi -s /tmp/uwsgi.sock -w myapp:app -H ~/.virtualenvs/myapp
Hope this helps next time someone comes looking for this one.
Thanks to Cody for pointing it out in the comments.