Hello everyone I was solving some kattis problems. In kattis I noticed thay allow us to download the .in files and .ans files , I was wondering how to check my java programs using these files, can anybody help?

Hello code forces, Two days back I have started my own blog called sport programming with me . In these blogs I will be telling about the questions I am practicing, Through the practice I am going to try to increase my rating. If anyone else is a newbie and wants to increase his/her rating you can practice with me .
I would also requests the people with high rating and who have more experience to guide me if the practice I am doing is logical or should I have a different strategy,

Thanks in advance :D

link to my blogs : https://sportprogramming-withme.blogspot.com/

I am new to chelper and after followiung all the instructions mentioned in the blog I am still facing a issue. ![ ](https://i.ibb.co/bLQCQs6/Screenshot-2020-12-01-at-11-38-56-AM.png" alt="Screenshot-2020-12-01-at-11-38-56-AM
This is he screenshot of the error!

Thanks a lot in advance!
EDIT: I got the solution on https://www.youtube.com/watch?v=VlfQ6rV1dk4