I am having the same issue after the feature extraction. No details on the error which is annoying..
NO70
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I ended up solving the problem. I just adjusted the frame prediction window to include less frames.
The whole app freezes.
It is actually just seems to be that thread, I can actually exit and enter the app continuously and can append another 16 objects each time.
To be honest I think I gave up on this feature, I could not figure it out.