@Oscar_Rangel I fix the error. You cannot load the model directly since the state_dict contains a structure like
network
   |--- __init__.py
   |--- models.py
   |--- xception.py

Therefore, you need to build a folder named network and then copy models.py and xception.py from FF++, then you can import the model file. Remember to add init.py then you can import these two files without an absolute path.