| 1 | [10Oct2025 03:00:30.559] [Netty Epoll Server IO #7/ERROR] [net.minecraft.network.Connection/]: Exception caught in connection
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| 2 | io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:custom_payload'
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| 3 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:55) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 4 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:14) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 5 | at TRANSFORMER/neoforge@21.1.208/net.neoforged.neoforge.network.filters.GenericPacketSplitter.encode(GenericPacketSplitter.java:104) ~[neoforge-21.1.208-universal.jar%23212!/:?]
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| 6 | at TRANSFORMER/neoforge@21.1.208/net.neoforged.neoforge.network.filters.GenericPacketSplitter.encode(GenericPacketSplitter.java:39) ~[neoforge-21.1.208-universal.jar%23212!/:?]
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| 7 | at MC-BOOTSTRAP/io.netty.codec@4.1.97.Final/io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:90) ~[netty-codec-4.1.97.Final.jar%23102!/:4.1.97.Final]
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| 8 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 9 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 10 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 11 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 12 | at MC-BOOTSTRAP/io.netty.codec@4.1.97.Final/io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.97.Final.jar%23102!/:4.1.97.Final]
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| 13 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 14 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 15 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 16 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 17 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 18 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection$2.write(Connection.java:528) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 19 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 20 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 21 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 22 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 23 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:851) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 24 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.DefaultChannelPipeline.write(DefaultChannelPipeline.java:1010) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 25 | at MC-BOOTSTRAP/io.netty.transport@4.1.97.Final/io.netty.channel.AbstractChannel.write(AbstractChannel.java:296) ~[netty-transport-4.1.97.Final.jar%23106!/:4.1.97.Final]
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| 26 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection.doSendPacket$mixinextras$wrapped$81(Connection.java:364) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 27 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection.mixinextras$bridge$doSendPacket$mixinextras$wrapped$81$82(Connection.java) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 28 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection.wrapMethod$zcb000$modernfix$checkClientPresence(Connection.java:750) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 29 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection.doSendPacket(Connection.java) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 30 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection.lambda$sendPacket$12(Connection.java:359) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 31 | at MC-BOOTSTRAP/io.netty.common@4.1.97.Final/io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.97.Final.jar%23103!/:4.1.97.Final]
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| 32 | at MC-BOOTSTRAP/io.netty.common@4.1.97.Final/io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.97.Final.jar%23103!/:4.1.97.Final]
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| 33 | at MC-BOOTSTRAP/io.netty.common@4.1.97.Final/io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.97.Final.jar%23103!/:4.1.97.Final]
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| 34 | at MC-BOOTSTRAP/io.netty.transport.classes.epoll@4.1.97.Final/io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:413) ~[netty-transport-classes-epoll-4.1.97.Final.jar%23107!/:4.1.97.Final]
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| 35 | at MC-BOOTSTRAP/io.netty.common@4.1.97.Final/io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.97.Final.jar%23103!/:4.1.97.Final]
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| 36 | at MC-BOOTSTRAP/io.netty.common@4.1.97.Final/io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.97.Final.jar%23103!/:4.1.97.Final]
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| 37 | at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
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| 38 | Caused by: java.lang.RuntimeException: Failed encoding custom payload create:contraption_seat_mapping: java.util.ConcurrentModificationException
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| 39 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.writeCap(CustomPacketPayload.java:42) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 40 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:47) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 41 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:29) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 42 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.StreamCodec$4.encode(StreamCodec.java:81) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 43 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:97) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 44 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:87) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 45 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 46 | ... 34 more
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| 47 | Caused by: java.util.ConcurrentModificationException
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| 48 | at java.base/java.util.HashMap.forEach(HashMap.java:1432) ~[?:?]
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| 49 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.ByteBufCodecs$22.encode(ByteBufCodecs.java:404) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 50 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.ByteBufCodecs$22.encode(ByteBufCodecs.java:401) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 51 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.StreamCodec$9.encode(StreamCodec.java:180) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 52 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.writeCap(CustomPacketPayload.java:40) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 53 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:47) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 54 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.common.custom.CustomPacketPayload$1.encode(CustomPacketPayload.java:29) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 55 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.StreamCodec$4.encode(StreamCodec.java:81) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 56 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:97) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 57 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:87) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 58 | at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[server-1.21.1-20240808.144430-srg.jar%23211!/:?]
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| 59 | ... 34 more
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| 60 | [10Oct2025 03:00:30.603] [Server thread/INFO] [net.minecraft.server.network.ServerGamePacketListenerImpl/]: Chenip4n lost connection: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:custom_payload'
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| 61 | [10Oct2025 03:00:30.603] [Server thread/INFO] [net.minecraft.server.MinecraftServer/]: Chenip4n left the game
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| 62 | [10Oct2025 03:00:30.646] [Server thread/INFO] [voicechat/]: [voicechat] Disconnecting client Chenip4n
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