modded server - "internal exception: [...] Payload may not be larger than 1048576 bytes"

[nelly]

new to messing with modpacks. the server starts and the pack is playable on personal worlds, but every time i try to enter the server, i get "internal exception: io.netty.handler.codec.DecoderException: java.lang.IllegalArgumentException: Payload may not be larger than 1048576 bytes" and it boots me. not sure what this means. the debug log is essentially gibberish to me and i'm not sure... about anything. is it saying that it's sending me too much data? if it helps at all, my mc username is "leucanella", and the disconnect reasons are near the very bottom (at least once was due to mismatched modlists, but i got that fixed i'm pretty sure). i just can't make sense of it myself.

https://gist.github.com/idlebird/c5269e80434a501104f6b99ebc16be46

[TileEntity]

Add PacketFixer:

https://www.curseforge.com/minecraft/mc-mods/packet-fixer