Cannot import the package in a jupyter notebook

[Tom-P7]

I can not import the pyqt_fit package.

The problem starts in the "pyqt_fit/init.py" file at line 12:

from . import functions, residuals

The error eventually shows up in anaconda3/lib/python3.8/genericpath.py in _check_arg_types(funcname, *args) at line 152 as:

TypeError: join() argument must be str, bytes, or os.PathLike object, not 'method'.

I am using python 3.8.8 and I have simply placed the PyQt-fit package in the same folder where I am running the jupyter session, meaning no installation.