subprocess.Popen on windows cannot use default handles for stdin/stdout/stderr when some of them are redirected #128424 ...

I believe this is the cause of the problem. Is there any tricks for running subprocess from PyInstaller that could be related to this issue? I thought that spawning from subprocess would always create ...

Error subprocess-exited-with-error will prevent your Python script from running, but you can fix it by following the steps from this guide.