After installing the ComfyUI plug-in, the software playground cannot be reopened

[cunkai]

[syyrmb]

I also encounter this and I want to add that:

1. This sometimes happens after fresh installation of ComfyUI, sometimes it happens after closing AI Playground when system memory is full and python.exe (under resources/ai-backend-env folder) automatically quits, and then reboot AI Playground program.
2. This happens probably because the "ls_level_zero.exe" gets mysteriously deleted when performing the actions above. Both "ai-backend-env" and "comfyui-backend-env" folder's "ls_level_zero.exe" can suffer from this.
3. A workaround I've found is either copy the "ls_level_zero.exe" from "ai-backend-env" to "comfyui-backend-env" folder, or delete "comfyui-backend-env" folder and try to re-install ComfyUI and hope it succeed. I now always have a copy of "ls_level_zero.exe" readily available in case one (or two) of the "ls_level_zero.exe" is deleted.