Like you, I had numerous extensions and was getting the same error messages. I removed all of them and returned FG to its original function and it was working fine. I then added each one back in so I could identify which ones were causing the issues.

The following extensions were malfunctioning....Better Module Window, Current HP, Weapon Handling, 5e Action Abilities and Advanced Effects....

I am running all of my other extensions and it is working fine now....hope this helps!