it shows value error , I'm not able to figure out why , inside predict_class there is an error i think so,

Question

chatbot.py file (https://drive.google.com/file/d/1QGjHy0EwV6eEntBjTD8D0lFdnckjbhzb/view?usp=sharing)

training.py file (https://drive.google.com/file/d/1Tt_DWp0tCo_us