Index error when trying to re-run training

[michelnv26]

I'm working on a training model a former graduate student was trying to create that tracks ferrets in our experiments. We've been having issues with identity swapping between the ferrets, particularly when the ferrets are on top of each other and SLEAP can't see all the nodes. I think it's mainly due to there only being 5 nodes on the skeleton, so when the ferrets are on top of each other, SLEAP can only see 2 nodes and can switch identities easily.

So far, I've been going through the training videos and fixing the tracks when I see the identity switch. I tried to rerun the training with the fixes but I get a index error that says the list index is out of range. I'm not familiar with coding, so I'm not sure how to fix the problem. Does anyone have any suggestions on both the identity switching and the index error?