$ pip install pyinstaller
(It installed successfully)
$ pyinstaller --onefile -w 'main.py'
(It created two folders, 'build' and 'dist', and a file, 'main.spec'. The 'dist' folder is where my .exe file is located)
Then, I downloaded the EXE file.
I deleted the EXE file.
I restored the EXE file with no content in it.
There was an error 500.
Oh, and by the way, you can’t go to the program anymore as I already solved the error (copy and paste; fork to a new Repl). It’s been closed for a while now. I just don’t know how to officially close it.