I uploaded a new version of ChatIt that turns off the Multiple Chat window feature, so no one else has this problem until I can find a way to get the multiple chat windows working again and I added some code that should automatically fix the problem for you.
ChatIt Version 3.6- Install the new version of ChatIt version 3.6
- Reload the ui by typing /reloadui in the chat window (you will still see the errors)
- Then reload the ui again and the errors should stop.