Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: Index 25 out of bounds for length 5

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OS Name/Version: Debian GNU/ Linux 12

Product Name/Version: (Always use the full version number - not ‘Latest’) AMP “PHOBOS” v2.6.0.6

Problem Description:

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Steps to reproduce:

  • Step 1 Uploading mods to Server and deinstalling Client-only mods
  • Step 2 Starting the server; starting modded minecraft
  • Step 3 Joining Server; receiving ERROR Message

Actions taken to resolve so far: De- and Reinstalled Modpack on Client and server; removed Client-only mods

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That’s a generic packet error, you’ll want to read the log to see if there’s any further information.
Make sure that you have the right modloader and version selected as well.