Chunk Importing Error

[MyUsernameIsThisText]

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Hello y'all

So I tried the last few days to recover my hardcore world from corruption, because there were 2 different seeds loaded into one world. The first time I tried it everything went well including with entities and the spawn chunks were recovered from the corruption. But when I tried it the last few days that have passed, terminal kept telling me that sun.reflect.Reflection.getCallerClass is not supported. Do any of you guys know what to do about this bug/glitch or whatever it is? I expected it to work more then one time in the same world. So I don't know why it doesn't want to work anymore or keep glitching out :/

Anyways thank you for reading this :) Btw I have MCA selector on a MacBook Air so maybe this helps a little bit.