Missing library miniupnpc but it was just installed

[molden]

Went to Advanced > Diagnostics and tested modules to ensure all were installed.

Found these reported as missing:
cffi
usb
miniupnpc
pycparser
pyftdi

Used pip to try to install each. Messages received after each pip install operation:

pycparser - "Requirement already satisfied: pycparser in /usr/local/lib/python2.7/dist-packages"
miniupnpc - Successfully installed miniupnpc-1.9
cffi - I got 2 messages:
- Requirement already satisfied: cffi in /usr/local/lib/python2.7/dist-packages
- Requirement already satisfied: pycparser in /usr/local/lib/python2.7/dist-packages (from cffi)
usb - Could not find a version that satisfies the requirement usb (from versions: )
- No matching distribution found for usb
pyftdi - Successfully installed pyftdi-0.25.2 pyusb-1.0.0

So all but usb are reportedly installed but rerunning the diagnostics test shows them all still missing.

Tried configuring UPNP Port Forwarding and message appears at top of app "Missing library: miniupnpc".

How do I resolve?

[kevin]

Make sure to restart gunicorn after installing new modules - if you have done that and it still doesn't work, make sure that all the requisites for miniupnpc are installed including the client libraries from source from here http://miniupnp.free.fr/files/