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I had the same problem. I was running the command without being with the environment enabled virtualenv. Then I had a problem for this in the wrong directory.
Sorry for my english.
I was having the same problem. What I did was give permission to the nginx user in the gunicorn file.
I hope you help them :)
I had the same issue.
Reason being that I had installed gunicorn via apt, which was then running in the system-wide Python 2 installation, instead of my venv.
Fixed it by uninstalling the system gunicorn, and then activating my venv, and installing gunicorn to the venv using pip install gunicorn. Then it worked straight away.