• This issue is not solved in a development build 5.3.0 snapshot 726

Players are getting kicked from server with set_container error
A clear and concise description of what the bug is.

[03:47:16 ERROR]: Error sending packet clientbound/minecraft:container_set_content (skippable? false)
io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:container_set_content'
at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:20) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:26) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:12) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at net.minecraft.network.Connection$2.write(Connection.java:771) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at MythicMobs-5.7.2-SNAPSHOT.jar/io.lumine.mythic.core.volatilecode.v1_21_R1.packets.VolatileChannelHandler.write(VolatileChannelHandler.java:76) ~[MythicMobs-5.7.2-SNAPSHOT.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:879) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at TAB-Bridge v5.0.7 (1).jar/me.neznamy.tab.bridge.bukkit.BridgeChannelDuplexHandler.write(BridgeChannelDuplexHandler.java:31) ~[TAB-Bridge v5.0.7 (1).jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:879) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:940) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1020) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:311) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final]
at ProtocolLib (24).jar/com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:227) ~[ProtocolLib (24).jar:?]
at ProtocolLib (24).jar/com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:233) ~[ProtocolLib (24).jar:?]
at net.minecraft.network.Connection.doSendPacket(Connection.java:513) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.Connection.lambda$sendPacket$13(Connection.java:498) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at ProtocolLib (24).jar/com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.lambda$proxyRunnable$2(NettyEventLoopProxy.java:49) ~[ProtocolLib (24).jar:?]
at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:413) ~[netty-transport-classes-epoll-4.1.97.Final.jar:4.1.97.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.97.Final.jar:4.1.97.Final]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.RuntimeException: Error encoding component minecraft:lore
at net.minecraft.core.component.DataComponentPatch$1.encodeComponent(DataComponentPatch.java:151) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.core.component.DataComponentPatch$1.encode(DataComponentPatch.java:128) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.core.component.DataComponentPatch$1.encode(DataComponentPatch.java:66) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.world.item.ItemStack$1.encode(ItemStack.java:190) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.world.item.ItemStack$1.encode(ItemStack.java:154) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:413) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:395) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.protocol.game.ClientboundContainerSetContentPacket.write(ClientboundContainerSetContentPacket.java:57) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.StreamCodec$2.encode(StreamCodec.java:38) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:88) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:78) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
... 51 more
Caused by: java.util.ConcurrentModificationException
at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1095) ~[?:?]
at java.base/java.util.ArrayList$Itr.next(ArrayList.java:1049) ~[?:?]
at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:412) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:395) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.StreamCodec$4.encode(StreamCodec.java:72) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.core.component.DataComponentPatch$1.encodeComponent(DataComponentPatch.java:149) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.core.component.DataComponentPatch$1.encode(DataComponentPatch.java:128) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.core.component.DataComponentPatch$1.encode(DataComponentPatch.java:66) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.world.item.ItemStack$1.encode(ItemStack.java:190) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.world.item.ItemStack$1.encode(ItemStack.java:154) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:413) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:395) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.protocol.game.ClientboundContainerSetContentPacket.write(ClientboundContainerSetContentPacket.java:57) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.StreamCodec$2.encode(StreamCodec.java:38) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:88) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:78) ~[purpur-1.21.1.jar:1.21.1-2296-568a028]
... 51 more
[03:47:16 WARN]: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:container_set_content'
[03:47:16 WARN]: at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53)
[03:47:16 WARN]: at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:20)
[03:47:16 WARN]: at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:26)
[03:47:16 WARN]: at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:12)
[03:47:16 WARN]: at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856)
[03:47:16 WARN]: at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856)
[03:47:16 WARN]: at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856)
[03:47:16 WARN]: at io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113)
[03:47:16 WARN]: at net.minecraft.network.Connection$2.write(Connection.java:771)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856)
[03:47:16 WARN]: at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115)
[03:47:16 WARN]: at MythicMobs-5.7.2-SNAPSHOT.jar//io.lumine.mythic.core.volatilecode.v1_21_R1.packets.VolatileChannelHandler.write(VolatileChannelHandler.java:76)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:879)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856)
[03:47:16 WARN]: at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115)
[03:47:16 WARN]: at TAB-Bridge v5.0.7 (1).jar//me.neznamy.tab.bridge.bukkit.BridgeChannelDuplexHandler.write(BridgeChannelDuplexHandler.java:31)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:879)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:940)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966)
[03:47:16 WARN]: at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934)
[03:47:16 WARN]: at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1020)
[03:47:16 WARN]: at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:311)
[03:47:16 WARN]: at ProtocolLib (24).jar//com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:227)
[03:47:16 WARN]: at ProtocolLib (24).jar//com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:233)
[03:47:16 WARN]: at net.minecraft.network.Connection.doSendPacket(Connection.java:513)
[03:47:16 WARN]: at net.minecraft.network.Connection.lambda$sendPacket$13(Connection.java:498)
[03:47:16 WARN]: at ProtocolLib (24).jar//com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.lambda$proxyRunnable$2(NettyEventLoopProxy.java:49)
[03:47:16 WARN]: at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1095)
[03:47:16 WARN]: at java.base/java.util.ArrayList$Itr.next(ArrayList.java:1049)
[03:47:16 WARN]: at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:412)
[03:47:16 WARN]: at net.minecraft.network.codec.ByteBufCodecs$19.encode(ByteBufCodecs.java:395)
[03:47:16 WARN]: at net.minecraft.network.codec.StreamCodec$4.encode(StreamCodec.java:72)
[03:47:16 WARN]: at net.minecraft.core.component.DataComponentPatch$1.encodeComponent(DataComponentPatch.java:149)
[03:47:16 WARN]: ... 61 more