I don't think you broke anything.
There was an error classifying the move.
Thanks, I didn't think I broke anything, I just thought the admins might want to know about this, to alert them with a possible bug.

I also encountered the same error today
Based on your screenshot, it's likely due to how many variations there are and how deep it is in those variations.

This literally happens to me every day. I think chess.com might have some throttle mechanism so their servers don't get overwhelmed. It usually goes away when I give it some time and do it again.

I'm sure the devs are super busy, especially with managing the numbers right now.
For the record, it happens to me in this position, after I promoted to a bishop for the lols...
Got the above error while doing a game analysis. Thought you'd want to know. Game#58308610555