A Custom Payload error occurs.

[KayaIvanova]

Dear AtomicStryker, I was playing with my friends yesterday with the ATM10 v0.38 modpack and added this mod, and this error occurred and I was returned to the multiplayer lobby.

Below is the error message that is output in the console window.

[09:35:13] [Netty Server IO #6/ERROR] [minecraft/Connection]: Exception caught in connection io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:custom_payload' at TRANSFORMER/[email protected]/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:55) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:14) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.neoforged.neoforge.network.filters.GenericPacketSplitter.encode(GenericPacketSplitter.java:104) ~[neoforge-21.1.23-universal.jar%23352!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.neoforged.neoforge.network.filters.GenericPacketSplitter.encode(GenericPacketSplitter.java:39) ~[neoforge-21.1.23-universal.jar%23352!/:?] {re:classloading} at MC-BOOTSTRAP/[email protected]/io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:90) ~[netty-codec-4.1.97.Final.jar%23104!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.97.Final.jar%23104!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at TRANSFORMER/[email protected]/net.minecraft.network.Connection$2.write(Connection.java:528) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:851) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.DefaultChannelPipeline.write(DefaultChannelPipeline.java:1010) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.AbstractChannel.write(AbstractChannel.java:296) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at TRANSFORMER/[email protected]/net.minecraft.network.Connection.doSendPacket(Connection.java:364) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading,re:mixin} at TRANSFORMER/[email protected]/net.minecraft.network.Connection.lambda$sendPacket$12(Connection.java:359) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading,re:mixin} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569) ~[netty-transport-4.1.97.Final.jar%23108!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at MC-BOOTSTRAP/[email protected]/io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.97.Final.jar%23105!/:4.1.97.Final] {} at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] {re:mixin} Caused by: java.lang.RuntimeException: Failed encoding custom payload infernalmobs:velocity: java.lang.ClassCastException: class atomicstryker.infernalmobs.common.network.VelocityPacket cannot be cast to class net.minecraft.network.protocol.common.custom.DiscardedPayload (atomicstryker.infernalmobs.common.network.VelocityPacket is in module [email protected] of loader 'TRANSFORMER' @307af381; net.minecraft.network.protocol.common.custom.DiscardedPayload is in module [email protected] of loader 'TRANSFORMER' @307af381) at TRANSFORMER/[email protected]/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.writeCap(CustomPacketPayload.java:42) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:47) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:29) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$4.encode(StreamCodec.java:81) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:97) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:87) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} ... 31 more Caused by: java.lang.ClassCastException: class atomicstryker.infernalmobs.common.network.VelocityPacket cannot be cast to class net.minecraft.network.protocol.common.custom.DiscardedPayload (atomicstryker.infernalmobs.common.network.VelocityPacket is in module [email protected] of loader 'TRANSFORMER' @307af381; net.minecraft.network.protocol.common.custom.DiscardedPayload is in module [email protected] of loader 'TRANSFORMER' @307af381) at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$2.encode(StreamCodec.java:42) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.writeCap(CustomPacketPayload.java:40) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:47) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:29) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$4.encode(StreamCodec.java:81) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:97) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:87) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} at TRANSFORMER/[email protected]/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[server-1.21.1-20240808.144430-srg.jar%23351!/:?] {re:classloading} ... 31 more [09:35:13] [Server thread/INFO] [minecraft/ServerGamePacketListenerImpl]: Nickname lost connection: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:custom_payload' [09:35:13] [Server thread/INFO] [minecraft/MinecraftServer]: Nickname left the game

I am not familiar with English, so I wrote this using Google Translate, so the sentences may be awkward.