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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, it can still cause problems for ...
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Internal Exception: io.netty.handler.codec.DecoderException: Failed to decode packet 'clientbound/minecraft:cookie_request'

Hello, I am dealing with issue on connecting to the proxy, when I try to connect it disconnects me and says: "Internal Exception: io.netty.handler.codec ...
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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: ...