ModuleNotFoundError:No module named 'omni

[159chenJie159]

I tried to use "semu.xr.openxr" with a matching version, and my environment is Ubuntu 20.04 isaac sim 2022.1.1.
The extension was added via git url, but the corresponding UI could not be launched. isaac sim is disabled. The next time isaac sim is restarted, it cannot be successfully restarted with an error message of "ModuleNotFoundError:No module named 'omni'".
I tried to install the omni package in this python environment with the command "./ python.sh -m pip install omni ", which would resolve the error, but when I started isaac sim on the terminal with the command "./isaac-sim.sh", I got a new error. The error is "ModuleNotFoundError:No module named 'omni.ext'". I do not know why this problem is caused at present, and hope to get your answer.