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Debug paste link:

Description and relevant errors:

My code: https://pastebin.com/z4APYiW8
Error: https://pastebin.com/gXpFd5xJ

This line is my 275th "WrappedParticle par = e.getPacket().getNewParticles().read(0);" which causes the error. I was using this code in 1.12.2 and tried to update to 1.13.1 but couldnt figure it out. Can you help me please?

Look at wiki.vg to find out the new structure of the packet.

Should be fixed in latest dev build. Forgot to initialize the reflection.

Thanks!