qt.qpa.xcb: could not connect to display

[44314474]

Hello! When i run the script, i met a problem. The problem:
Parsing CAFE report... done!
Writing test/summary.pdf
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.

Available platform plugins are: eglfs, minimal, minimalegl, offscreen, vnc, webgl, xcb.

Aborted (core dumped)

This is my code:python3 ./cafe_fig.py example_result.cafe -c Isoptera=zne,mna -pb 0.05 -pf 0.05 --dump test/ -g .pdf --count_all_expansions

The data i used the example.

Thank you very much!!