phypartspiecharts.py running error

[xueqinerer]

Hello,
I am trying to use your script to plot pie charts on the species phylogeny showing the percentage of concordant gene trees. I followed your tutorial to make the example,the script is as follows:
cd phyparts_example
python ../phypartspiecharts.py species.tre out 648

The problem was shown that "qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" 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." How should I solve this problem?

Thanks for the help.
Xueqin