I get the same problem. In my case, i found "pycache" folder inside my project, then i deleted it. After that, i ran auto-py-to-exe again and it worked. Check your code again, all imported libraries are working well, then try the second way:

1. copy your python file to other folder
2. Open a command prompt or terminal to navigate your script’s directory: cd path\to\your\script
3. Run pysinstaller: pyinstaller --onefile your_script.py