Gae_e

A few hours ago I noticed this problem on my server: "Internal Exception: lo.netty.handler.codec.DecoderException: Jayalang.IndexOutOfBoundsException: Index 26 out of bounds for length 10". I have tried everything to solve the problem, but when I remove the mods and change the version to vanilla I can just enter my server. So, I deduce that the problem must be with forge. I searched more forums about the problem, but I didn't see a concrete solution for this either. I use the original minecraft and I created the server in aternos version 1.20.4, I hope soon an answer. Thanks