Getting "list out of range" error while running run_squad.py from huggingface for question answering. How to solve?

Question

So trying to run the script 'run_squad.py' provided by huggingface. Used the code to convert csv to json squad 2.0 format which gives the correct format when checked.

code:

But when trying to run the script, it gives error "list out of range", [what could be the problem?