null bytes

[Clifford Neal Simon]

Hello,

I am creating an application based on tkinter and matplotlib. I have a new problem when I launch the frozen app. Here is the minimal example that reproduces the problem:

(minimal.py)

from mpl_toolkits.mplot3d import Axes3D

print('hello world')

> python minimal.py

hello world

> pyinstaller minimal.py

(...)

> dist\minimal\minimal

Traceback (most recent call last):

  File "minimal.py", line 2, in <module>

    print('hello world')

  File "<frozen importlib._bootstrap>", line 991, in _find_and_load

  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked

  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked

  File "PyInstaller\loader\pyimod03_importers.py", line 493, in exec_module

ValueError: source code string cannot contain null bytes

[2328] Failed to execute script 'minimal' due to unhandled exception!

OS: Windows

python 3.8.6

pyinstaller 4.4

matplotlib 3.4.2

Thanks,

Clifford Simon