[BUG] Error When running extension

[TacoTuesdays2020]

I installed the extension from the extensions tab, I completely close SD and restart from webui-user.bat. SD loads with no tab for the extensions but it shows the extension is installed in the extensions tab. I cannot figure out how to solve this issue please help. For some reason it looks like the extension cant fin the postporcessing-upscale.py script

To Reproduce
Steps to reproduce the behavior:

1. Webui-user.bat

Screenshots of error

Desktop (please complete the following information):

• OS:Windows 11

[illtellyoulater]

I was experiencing exactly the same errors and the only thing that fix it was reinstalling the python venv.

Just delete the venv/ dir in sd-webui/, then the next time you run webui.sh or webui.bat the venv will be regenerated (the process will take a few minutes but then you'll start with a fresh python which will probably end up fixing any other minor issues that could have stacked with time.