how fix this warn

[cuervito]

What behaviour is expected:

What you expected to see
hello I put the last paper 1.12 and it gives me a warn all the time

What behaviour is observed:

What you actually saw
12:49:09] [Netty Epoll Server IO #1/WARN]: [io.netty.channel.DefaultChannelPipeline] An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
java.nio.channels.ClosedChannelException: null

Steps/models to reproduce:

This may include a build schematic, a video, or detailed instructions to help reconstruct the issue

Plugin list:

A list of your plugins
Paper version git-Paper-1500 (MC: 1.12.2) (Implementing API version 1.12.2-R0.1-SNAPSHOT)

Paper build number:

This can be found by running /version on your server. latest is not a proper version number; we require the output of /version so we can properly track down the issue.

Anything else:

Anything else you think may help us resolve the problem

[aikar]

Do you really have no plugins? Please list your plugins, as this is caused by plugins.

Or are you using ViaVersion on Bungee and 1.13 is trying to connect?

[cuervito]

yes i have plugins .. AAC, AACAdditionPro, CancelSounds, ChatGuard, ChestCommands, CustomJoinItems, Essentials, EssentialsChat, FastAsyncWorldEdit, FastPot, GUIPlus, HolographicDisplays, LeaderHeads, NoRain, OldCombatMechanics, PermissionsEx, PlaceholderAPI, PressureCommand, ProtocolLib, ProtocolSupportPotions, SkyWars, SmoothKnockback, Vault, ViaBackwards, ViaRewind, ViaRewind-Legacy-Support, ViaVersion, WorldEdit, WorldGuard.. i using viaversion last

[aikar]

one of the Via plugins will be the source of this issue. Please report issue to them.