When creating a simple executable (Windows) with pyinstaller, my py script can be compiled, but when starting it, it fails with:

Traceback (most recent call last): File “salsatest.py”, line 1, in File “PyInstallerloaderpyimod02_importers.py”, line 419, in exec_module File “salsa20.py”, line 18, in File “imp.py”, line 297, in find_module ImportError: No module named ‘_salsa20’ [3400] Failed to execute script ‘salsatest’ due to unhandled exception!

Here is the simple python script salsatest.py

    from salsa20 import XSalsa20_xor
    from os import urandom
    IV = urandom(24)
    KEY = b'secretsecretsecretsecretsecretsecret'
    ciphertext = XSalsa20_xor(b"IT'S A YELLOW SUBMARINE", IV, KEY[0:32])
    print(ciphertext)
    print(XSalsa20_xor(ciphertext, IV, KEY[0:32]).decode()) 

I am using pyinstaller version 6.6.0 and python Python 3.11.9
The salsa library was installed before with

pip install salsa20