Getting error in extract_features.py

Hi, I ran the 1_move_files.py and 2_extract_files.py successfully. after that, I tried running the extract_features.py, it gives me the following error

File "C:\Users\Preeti Gupta\Downloads\five-video-classification-methods-master\data.py", line 81, in get_classes if item[1] not in classes:

IndexError: list index out of range