Pyinstaller - "Fatal error ! Failed to execute script" when using multiprocessing.freeze_support

Question

I am using pyinstaller(v3.2.1) to build a --onefile windows exe. I am using multiprocessing within my python (v3.5.3) script. I have implemented the below mentioned workaround for windows.

Recipe Multiprocessing

Logically, my python script does not span multiple process unless required / conditions are met and is working as expected. The issue I have is that, whenever multiple processes are involved, everything seems fine. But in case, if multiprocess is not involed, the below "Fatal: Could not execute the script" dialog box flashes for couple of seconds or more and then disappears still returning the expected results.

Is there anything I am missing that is causing the fatal error dialog to appear and disappear ? I suspect the multiprocessing.freeze() statement right after if __name__ == __main__ : might be causing the issue when new processes are not created!

Answer 1

I had the same issue and followed Eugene Chabanov's advise of using pyinstaller without any special characters just pyinstaller yourapp.py, when the exe was ready I opened it using the windows CMD and it got stuck in CMD with the error:

ModuleNotFoundError: No module named 'babel.numbers'

I then ran pyinstaller again this time pyinstaller -F --hidden-import "babel.numbers" test.py and it works beautifully.

Try to see what error you get and if it is "ModuleNotFoundError" then just run pyinstaller adding --hidden-import "missing_module_name".

I hope it helps.

These people deserve the credit for helping me:

--hidden-import "missing_module_name" - M. R.

run without windowed - Eugene Chabanov

Answer 2

I've had similar issue and solved it by running compile command without -windowed prefix and then launching exe file using command line. It allowed to see where the error was. Script was referring to a file that wasn't there. Error popped out on another computer, while everything was ok on mine. (because of hardcoded file in place)