I am running python 3.5, via an up-to-date anaconda distribution, on windows 7. When I use Qt5Agg as the matplotlib backend (set via my matplotlibrc file), I get the error in the subject line. It is very simple to reproduce:
- Start python from a cmd.exe prompt
- from pylab import *
- figure(1)
Same problem in ipython.
Thoughts? Thanks.