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How to fix Minecraft Internal Exception Error (io.netty.handler or Java.IO.IOException)

Minecraft Internal Exception errors can be frustrating to get rid of if you do not know what to do. While Minecraft isn't one of the most graphically intensive games ...
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Getting Internal Exception: io.netty.handler.codec.EncoderException

When joining with MC (Badlion in my Case idk) 1.20.4 on a Spigot 1.20.5 Server some Players get following Error (picture). We have 2 Players on the Server where IT ...
GitHub

lost connection: Internal Exception: io.netty.handler.codec.EncoderException

[16:27:18 WARN]: [ViaVersion] ERROR IN Protocol1_21To1_20_5 IN REMAP OF CONTAINER_SET_SLOT (0x15) [16:27:18 WARN]: io.netty.handler.codec.EncoderException: ...