h5p error that we can't diagnose

Hello: I'm a total newbie, trying to diagnose an issue on something that was created for us who is no longer available. h5p is running within Drupal. When someone with admin access went to edit a course presentation slide, she started to get an error message (on node=21). Now, we just keep getting error messages whenever we try to access or edit. 

I am currently trying to rebuild the h5p cache, but not sure that will take care of the problem. (It's also been running for almost 2 hours.)  I also see a couple of h5p updates that are needed, but again, I don't know why these errors would come up *today*. 

Any advice or additional information I can provide to try to diagnose? BTW, Node 12 is a previous iteration of that same thing and *that* works fine.