[Python] VSCODE - I suddenly got the following error when running any program, e.g.,...

All of a sudden I get the following error when running all programs:

PS C:\Users\raysm\vscode\resource_lib\src> & 'c:\Users\Owner\AppData\Local\Programs\Python\Python313\python.exe' 'c:\Users\Owner\.vscode\extensions\ms-python.debugpy-2025.10.0-win32-x64\bundled\libs\debugpy\launcher' '60015' '--' '-m' 'uvicorn' 'main:app' '--reload'
INFO: Will watch for changes in these directories: ['C:\\Users\\raysm\\vscode\\resource_lib\\src']
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: Started reloader process [21876] using StatReload
ERROR: Error loading ASGI app. Could Error loading ASGI app. Could nonot import module "main".


my simplest program is as follows:

# simple.py
print("Hello World!")


I've tried removing uvicorn and reinstalling. I try running without debugging.

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