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This prevents players from joining the server with this error:
[18:56:52 ERROR]: Error sending packet clientbound/minecraft:set_entity_data io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:set_entity_data' at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:55) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:13) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:27) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:12) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at net.minecraft.network.Connection$2.write(Connection.java:728) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at TAB v5.0.3.jar/me.neznamy.tab.shared.features.injection.NettyPipelineInjector$TabChannelDuplexHandler.write(NettyPipelineInjector.java:78) ~[TAB v5.0.3.jar:?] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at TradeSystem_v2.6.3.jar/de.codingair.tradesystem.lib.codingapi.player.data.PacketReader$1.write(PacketReader.java:85) ~[TradeSystem_v2.6.3.jar:?] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at TradeSystem_v2.6.3.jar/de.codingair.tradesystem.lib.codingapi.player.data.PacketReader$1.write(PacketReader.java:85) ~[TradeSystem_v2.6.3.jar:?] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:891) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:956) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:982) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:950) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:969) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:310) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final] at ProtocolLib.jar/com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:227) ~[ProtocolLib.jar:?] at ProtocolLib.jar/com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:233) ~[ProtocolLib.jar:?] at net.minecraft.network.Connection.doSendPacket(Connection.java:492) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.Connection.lambda$sendPacket$13(Connection.java:479) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at ProtocolLib.jar/com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.lambda$proxyRunnable$2(NettyEventLoopProxy.java:49) ~[ProtocolLib.jar:?] at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) ~[netty-common-4.1.115.Final.jar:4.1.115.Final] at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) ~[netty-common-4.1.115.Final.jar:4.1.115.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) ~[netty-common-4.1.115.Final.jar:4.1.115.Final] at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:405) ~[netty-transport-classes-epoll-4.1.115.Final.jar:4.1.115.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.115.Final.jar:4.1.115.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.115.Final.jar:4.1.115.Final] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?] Caused by: java.lang.ClassCastException: class java.lang.Byte cannot be cast to class net.minecraft.core.Rotations (java.lang.Byte is in module java.base of loader 'bootstrap'; net.minecraft.core.Rotations is in unnamed module of loader java.net.URLClassLoader @7ab2bfe1) at net.minecraft.core.Rotations$1.encode(Rotations.java:10) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.syncher.SynchedEntityData$DataValue.write(SynchedEntityData.java:247) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.pack(ClientboundSetEntityDataPacket.java:24) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.write(ClientboundSetEntityDataPacket.java:44) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.codec.StreamCodec$2.encode(StreamCodec.java:40) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:90) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:80) ~[paper-1.21.4.jar:1.21.4-118-73f7736] at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[paper-1.21.4.jar:1.21.4-118-73f7736] ... 56 more
This error message is a bit deceptive because it doesn't include the plugin name, but I determined that it was this plugin using a process of elimination.
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Update to 1.21.4:
Note: To be honest I never contributed to anything on github yet. I tested and this works after building