Io netty error

[Daddie2]

i'm using the rouge and adventures 2 modpack and your mod keep give error minecraft 1.16.5

[hersheyunkers]

Hi i also am going through this with aternos, rad2 1.16.5, made an account so i hope im posting here correctly. I also finally got something new to show up so this might help fix this.

[23Mar2023 14:53:34.141] [Netty Epoll Server IO #3/ERROR] [net.minecraft.command.arguments.ArgumentTypes/]: Could not serialize com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument@1f0da25f (class com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument) - will not be sent to client!
[23Mar2023 14:53:34.141] [Netty Epoll Server IO #3/ERROR] [net.minecraft.command.arguments.ArgumentTypes/]: Could not serialize com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument@3fa3f859 (class com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument) - will not be sent to client!
[23Mar2023 14:53:34.806] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 2499ms or 49 ticks behind
[23Mar2023 14:53:34.913] [Netty Epoll Server IO #3/ERROR] [net.minecraft.command.arguments.ArgumentTypes/]: Could not serialize com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument@1f0da25f (class com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument) - will not be sent to client!
[23Mar2023 14:53:34.913] [Netty Epoll Server IO #3/ERROR] [net.minecraft.command.arguments.ArgumentTypes/]: Could not serialize com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument@3fa3f859 (class com.infamous.dungeons_libraries.commands.arguments.MobEnchantmentArgument) - will not be sent to client!
[23Mar2023 14:53:53.917] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 2060ms or 41 ticks behind
[23Mar2023 14:54:12.487] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 3581ms or 71 ticks behind
[23Mar2023 14:54:31.333] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 3876ms or 77 ticks behind
[23Mar2023 14:55:01.262] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 2006ms or 40 ticks behind
[23Mar2023 14:55:18.629] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 2373ms or 47 ticks behind
[23Mar2023 14:56:02.236] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 2029ms or 40 ticks behind
[23Mar2023 14:56:36.729] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 3323ms or 66 ticks behind
[23Mar2023 14:56:55.851] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 4144ms or 82 ticks behind
[23Mar2023 14:58:29.076] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 2020ms or 40 ticks behind
[23Mar2023 14:58:43.345] [Netty Epoll Server IO #1/ERROR] [net.minecraft.network.NettyPacketEncoder/]: Error encoding packet
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1469) ~[?:1.8.0_362]
at java.util.HashMap$KeyIterator.next(HashMap.java:1493) ~[?:1.8.0_362]
at net.minecraft.nbt.CompoundNBT.func_74734_a(CompoundNBT.java:82) ~[?:?]
at net.minecraft.nbt.CompressedStreamTools.func_150663_a(CompressedStreamTools.java:103) ~[?:?]
at net.minecraft.nbt.CompressedStreamTools.func_74800_a(CompressedStreamTools.java:96) ~[?:?]
at net.minecraft.network.PacketBuffer.func_150786_a(PacketBuffer.java:253) ~[?:?]
at net.minecraft.network.PacketBuffer.writeItemStack(PacketBuffer.java:311) ~[?:?]
at net.minecraft.network.PacketBuffer.func_150788_a(PacketBuffer.java:290) ~[?:?]
at net.minecraft.network.play.server.SEntityEquipmentPacket.func_148840_b(SourceFile:54) ~[?:?]
at net.minecraft.network.NettyPacketEncoder.encode(NettyPacketEncoder.java:38) ~[?:?]
at net.minecraft.network.NettyPacketEncoder.encode(NettyPacketEncoder.java:12) ~[?:?]
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:730) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:816) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:723) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:111) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:801) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1071) ~[server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:300) ~[server-1.16.5-20210115.111550-extra.jar:?]
at net.minecraft.network.NetworkManager.lambda$sendPacket$5(NetworkManager.java:196) ~[?:?]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) [server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:313) [server-1.16.5-20210115.111550-extra.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) [server-1.16.5-20210115.111550-extra.jar:?]
at java.lang.Thread.run(Thread.java:750) [?:1.8.0_362]
[23Mar2023 14:58:43.374] [Server thread/INFO] [net.minecraft.network.play.ServerPlayNetHandler/]: HRWarriors lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.util.ConcurrentModificationException
[23Mar2023 14:58:43.374] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: HRWarriors left the game
[23Mar2023 14:58:49.459] [Server thread/WARN] [net.minecraft.server.MinecraftServer/]: Can't keep up! Is the server overloaded? Running 5402ms or 108 ticks behind
[23Mar2023 14:58:52.347] [Netty Epoll Server IO #5/WARN] [com.connectivity.Connectivity/]: Login payload for Registry minecraft:item is using 48.70% of max allowed vanilla size
[23Mar2023 14:58:52.364] [Netty Epoll Server IO #5/WARN] [com.connectivity.Connectivity/]: Login payload for Registry minecraft:block is using 29.569% of max allowed vanilla size