I think I fixed it this time. It was still happening if the Star Wars theme was activated.
Although I fixed, the party sheet background color is not right at the moment, if you keep the extension active.
I will update the star wars theme later and let you all know when you can redownload, but the error message is gone
I have just fixed this issue, please make sure to re-download both rulesets, by clicking "Check for updates"
For now please disable it before opening the campaign, I will see if I can update it to make it work with recent FG updates