Startup Issue with Minecraft - Internal Exception: io.netty.handler.codec.DecoderException: Unknown serializer type 111

Technical Support
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1

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Callisto’ v2.5.1.6 (Mainline)
Virtualization Docker
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Stopped

Problem Description

Issue

I can’t start the minecraft server, i added the mods and when i try to join the server it shows the error ‘‘Internal Exception: io.netty.handler.codec.DecoderException: Unknown serializer type 111’’ and i don’t know what to do.

Reproduction Steps

  • Added Mods
  • Started the server
  • I joined Minecraft
  • The error ‘‘Internal Exception: io.netty.handler.codec.DecoderException: Unknown serializer type 111’’ Appeared
2

Make sure you have the right modloader selected, and maybe try removing the mods you added to see if things are working right.

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