This application failed to start because no Qt platform plugin could be initialized

[haithienld]

Provide environment information

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/pidl/.local/lib/python3.9/site-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, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

What OS are you using?

Ubuntu 20.04

Describe the Bug

When I run labelme Folder. The bug happens

Expected Behavior

No response

To Reproduce

No response

[haithienld]

I fixed it.
After deleting all in the /home/pidl/.local/lib/python3.9/site-packages/cv2/qt/plugins folder that the bug still happens.
Please install. (with opencv-4.4)
sudo apt-get install qt5-default

[amaizr]

was able to work around this using this answer: NVlabs/instant-ngp#300 (comment)

[kaiesalmahmud]

I was facing the same issue. Turns out in my case, python 3.9 was causing this conflict.
I managed to solve this by creating a new environment with python 3.8.

commands:
conda create -n myenv python=3.8.0
conda activate myenv
pip3 install opencv-python==4.2.0.34

[a-pipi]

For me it worked to downgrade PyQt5 to version 5.13.2.

I am on Python version 3.10.6 and opencv-python version 4.7.0.72.

[bryanbocao]

pip install --upgrade pyqt5_tools

solved my issue.
Reference
https://github.com/fmjohnson97/habitat_heuristic/issues/2#issuecomment-1751440118

[kimkimyoung]

pip install opencv-python-headless

It works for me in a conda env

[sc0v0ne]

Use brew, which avoids these errors. On Ubuntu brew works.

brew install pyqt 
brew install wkentaro/labelme/labelme  # command line interface

[Jie-Huangi]

pip install opencv-python-headless

It works for me in a conda env
also sloved my issue, thanks.