What is this Error?

Hi, I test my world using ‘ClientSim’. At one point, my world output this Error.
If this error have bad effect on my world, I want to fix this error. If not, that is fine.

If this error is bad to my world, How can i fix this?

While I don’t know the specific thing that caused the error, it seems to have been a functionally unimportant hiccup that clientsim experienced. You should be free to ignore it going forward!

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Then i should be ignoring and keep going to developing… because i don’t know what is problem. Thank you for reply!