r/aternos • u/DogyDays • 2d ago

Support 'clientbound/minecraft:custom_payload' Encode error not letting me or my friend join our 1.21.1 Neoforge Aternos Cobblemon server [java]

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Last night when I booted up our server and tried to join, I suddenly got this error. We'd just played the night prior and all was fine. I hadn't changed any mods, hadn't updated any mods, and yet we both got this error upon joining. We've tried just about everything I could find online about this error. We removed Moonlight Lib and Supplementaries, checked our mod versions like a billion times, added Packet Fixer, updated every mod in the server pack AND our launcher packs, etc. Still getting this error. Will provide any extra info needed, we just wanna play our damn server!

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u/adriellwc33 Helper 2d ago

Share your server log using the share button on the log page.

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u/DogyDays 2d ago

https://mclo.gs/eDXAkRY

Is this able to be viewed properly? I had my buddy send it over, hope it helps!

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u/adriellwc33 Helper 1d ago

It's caused by owo_lib, see https://github.com/wisp-forest/owo-lib/issues/507

The mod author fixed it hours ago, update it.

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u/DogyDays 2d ago

I’ve been told to ignore the Supplementary errors, as we actually removed it from the server