io.netty.channel.StacklessClosedChannelException
[03:21:53 WARN]:        at io.netty.channel.AbstractChannel.close(ChannelPromise)(Unknown Source)
[03:21:53 WARN]: io.netty.channel.StacklessClosedChannelException
[03:21:53 WARN]:        at io.netty.channel.AbstractChannel.close(ChannelPromise)(Unknown Source)
[03:21:53 WARN]: io.netty.handler.timeout.ReadTimeoutException
is there error
io.netty.channel.StacklessClosedChannelException
This Spams Every 3-10 seconds

 at io.netty.channel.AbstractChannel.close(ChannelPromise)(Unknown Source)
[03:21:53 WARN]: io.netty.channel.StacklessClosedChannelException
this spams before it crashes and after it crashes

Plugins
-EssentialsX
-EssentialsGeoIp
-GriefPrevention
-Gsit
-HeadDrop
-Holographic Displays
-LuckPerms
-MarriageMaster
-McMMO
-PlaceholderAPI
-PlayerVaults
-Protocolib
-SkinsRestorer
-Tab
-Vault
-WorldEdit
-Worldgaurd

Paper 1.17.1#408
Java 17

notably missing among that plugin list is OldCombatMechanics, but because you are reporting this here I assume you have that installed as well. does removing OldCombatMechanics cause this to stop happening?

also please follow the issue template and provide a full server log file and your OCM config file

i do not have ocm

this is the OldCombatMechanics GitHub repository. it is meant for reporting issues with OldCombatMechanics. for general support consider opening a thread on the Spigot forums.