Cannot train model, TypeError: '>' not supported between instances of 'NoneType' and 'int'

[ginbobby]

Hello! I realize this issue has been reported before, but I cannot fix it.

I previously was able to train my model just fine, but now when I try and train, I get this error in the console:
TypeError: '>' not supported between instances of 'NoneType' and 'int'

It's using the same videos and I have trained fine in this project before, plus file path was unchanged. Since I figured it was an issue with the path, I re-imported all of my videos to a new folder and replaced the videos in sleap. But this did not work, I still get this popup:
"An error occurred while training centroid/centered_instance. Your command line terminal may have more information about the error."

Any help would be great! I've never used python before, so I don't really know what is happening half the time.