Ok, I tried delete all the collections and have a clean scene. Using official 2.90 installation and today 2.91 build, the same errors as I described previously
Seems like you're still using older add-on version. ( Base on your tool menu panel ) v2 of GGT should fix that issue
You might have to fully uninstall that add-on version (filesystem) and update for the newer one in github repo (dev branch)
Feel free to shoot me a message on the discord channel
Thank you, I posted my tests into Discord Bugs section
