qt plugin error

[Lxrenz11]

I am getting this issue whenever I run the face recognition webcam demo command:

qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/local/lib/python3.11/dist-packages/cv2/qt/plugins" 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: xcb (from /usr/local/lib/python3.11/dist-packages/cv2/qt/plugins), xcb.

I have this issue now for 10 hours and cant fix it please help me.