Connectivity Problem with Minecraft - Connectivity Issue, Getting Error

System Information

Field Value
Operating System Linux - Debian GNU/Linux 12 on x86_64
Product AMP ‘Callisto’ v2.5.0.8 (Mainline)
Virtualization Docker
Application Minecraft
Module MinecraftModule
Running in Container Yes
Current State Ready

Problem Description

Issue

Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: readerIndex(12) + length(1) exceeds writerIndex(12): PooledUnsafeDirectByteBuf(ridx:12, widx: 12, cap:12/13)

Reproduction Steps

  • Stopped instance from running
  • Downloaded FTB New Version and Stoneblock 3 Via the Configuration tab
  • Tried Starting the game and got an error

After downloading the modpack you need to tell AMP what version of Forge 1.18.2 to use, otherwise it will just start as vanilla.

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