Could not found main.py in submission.zip

After my uploaded submission file was unzipped, it showed me the error as follows:image
It seems that there is main.py file but why it says it couldn’t find it?
Could someone help me check with this? Thank you!
@bull

It looks like your main.py file is not at the root of the archive but in a directoy called “submssion”. If your archive was packed properly, you should see:
inflating: ./main.py