Trouble with Uwsgi settings
This is identical to the an issue raised with uwsgi and epxlained as follows:
you have uwsgi in /usr/local and plugins in /usr, it doesn't look right, looks like you two uwsgi installations and mixing them
The solution is to decide which binaries to use, and stick with it. The problem goes away as soon as not attempting to load /usr/-installed plugins from a /usr/local/-installed uwsgi build.