flet build linux can not find library

[jcgitacc]

I've a small desktop application where I import 'snap7'. When I run with flet run everything goes well, but when I do the build I and run I get this error:

Traceback (most recent call last):
File "", line 95, in
File "", line 229, in run_module
File "", line 88, in _run_code
File "/home/jc/.local/share/com.flet.test/flet/app/main.py", line 2, in
import snap7
ModuleNotFoundError: No module named 'snap7'

Help needed, thanks

[jcgitacc]

included library in 'pyproject.toml' file:
[project]
dependencies = [
"flet",
"python-snap7"
]