I am using interlabs.GPT.activities from Marketplace for my POC (Using Uipath community edition). I am not getting any Response, getting null value

I am using interlabs.GPT.activities from Marketplace for my POC (Using UiPath community edition). It worked well till one week back. Now I am not getting any Response, getting null value.
Endup getting the “Object reference not set to an instance of an object” error.
Please help me to resolve this issue.