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This is crashing when trying to add append a track that doesn't actually exist to a sequence (sequences are sometimes used under-the-hood to wrap media).
Does making the MXF file go offline, and then relinking it help? When you click on it, where are you clicking on it (i.e. in the Timeline Panel, in the Project Panel, etc)? Any screenshots you can share?
Making the MXF offline and relink again solved my problem.
But doesn't matter where I've clicked - same error in bin as in timeline but now everything just works fine again...
But I don't understand why this happened?
I don't understand why it happened either without more information.
You could perhaps post your saved project where it was happening and one of us could investigate for the future. That's probably the quickest thing to do without having to play 20 questions.
I'm glad the workaround helped you, but I'm sorry to hear that you had the problem in the first place.