I’m using pyinstaller to create an executable file from python script to run on Windows.
My python script does depend on a package that compiled from C-module. Package’s name is MT5Manager, if you want to try.
I run script standalone without any error by python main.py. But I retrieve error when I run by .exe file.

OS version: Windows 11

Python version: 3.12.3 from pyenv-win

pyinstaller==6.6.0

Please help me!

Here is step-by-step what I did:

1. Create an virtualenv

python -m venv .venv
.venvScriptactivate

2. Install package from pypi:

pip install MT5Manager pyinstaller

2. create a main.py with content as follows:

import numpy # I use this because I don't want to use --hidden-import in pyinstaller command
import MT5Manager

print("Prepair")
manager = MT5Manager.ManagerAPI()
print("OK.")

Output when I run python main.py standalone:

Prepair
OK.

Command I used to create executable file:

pyinstaller -F main.py --paths .venvLibsite-packages

Output when I run .distmain.exe:

Prepair
Traceback (most recent call last):
  File "main.py", line 5, in <module>
    manager = MT5Manager.ManagerAPI()
              ^^^^^^^^^^^^^^^^^^^^^^^
SystemError: <class 'MT5Manager.ManagerAPI'> returned NULL without setting an exception
[6680] Failed to execute script 'main' due to unhandled exception!