Tracking of course progression not working, related to Localstorage

Hi, I've tried to read the discussions on Localstorage and a bit out of my league. The developers provided the following feedback on the SCORM package I sent. "No data on Progress Token – training files progress token are not saving in localStorage, if progress token is not present in localStorage API calls to save-progress will fail and we will never resume the training if user closes or reload the tab."

I'm a total noob on variables and js, so not sure where to start. They did send an error log (see attached).  Hope someone can help, been struggling on this for a bit now.

Thanks in advance!