App not working due to site errors


We have installed an app but it is not working, we contacted the developers and the came back with this reply..

This is causing our script to delay and causing issues in its execution. Kindly fix the errors on your page and it should automatically fix the issues with our widget.

Can these errors be fixed easily or would I need to get a programmer to fix them for me? and if so would it be expensive. if so I think I would prefer to delete the app.


Any advise would be great

Many Thanks 

The small changes we make today, make greater changes for our future.