start failed in mac

[hellobiek]

run cmd:
python -B pyflow.py

results:

qt.qpa.plugin: Could not load the Qt platform plugin "cocoa" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: cocoa, minimal, offscreen.

[1] 27335 abort python -B pyflow.py

[hellobiek]

fixed by myself