ImportError with larger files

[bi3mw]

I get an error message when running the program with larger files (6.8 MB) ( parameter is "--gzip" but I think this is not the problem ). The error message is:

Traceback (most recent call last):
File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
exec(code, run_globals)
File "/home/matthias/Apps/pyminifier-master/pyminifier/main.py", line 4, in
from . import pyminify
ImportError: attempted relative import with no known parent package