java.lang.IllegalArgumentException: Unknown meta type

[Yorkforce]

We just started having this occur on one of our modpack servers, it's a brand new world and only seems to occur in a certain area of the world. (eg: we were moving from default world spawn to 0,0 coordinates.

Were at a complete loss tbh
Error from bungeecord log:
https://pastebin.com/JcnpHdUk

[md-5]

http://wiki.vg/Entity_metadata

There is no metadata with type 14 in vanilla.
Without knowing what the mod is and what data it is adding there is nothing we can do.
Even if we did, really the mod should be using plugin messages to handle custom data rather than changing the vanilla protocol.

[Yorkforce]

The actual forge log is this:

[04:27:02] [Netty Epoll Server IO 2/DEBUG] [FML]: Muted NetworkDispatcher exception
io.netty.channel.unix.Errors$NativeIoException: syscall:read(..) failed: Connection reset by peer
at io.netty.channel.unix.FileDescriptor.readAddress(..)(Unknown Source) ~[FileDescriptor.class:?]

We also got a Unknown meta type 16 error too.

Do you know if this is a mob? Were just trying to narrow it down to find out which mod is causing the problem.
Or could be caused by ViaVersion? (I'm unsure if you're referring to mc version protocol or a protocol in general)

[md-5]

No, you need to find the issue - we can only investigate issues that occur with vanilla, craftbukkit, or spigot

[MrCrayfish]

I know that this was closed a while ago but I recently ran into the issue. The problem lies with adding custom DataSerializers for Entities. I now have reverted to using plain primitives instead of a custom serializer. I disagree though that we are changing Vanilla's protocol because these are my own custom entities with values that I need synced to the client.

[md-5]

disagree though that we are changing Vanilla's protocol

custom DataSerializers

How is that NOT changing the protocol?

[MrCrayfish]

Okay, I take that back :/