[21:26:04 ERROR]: Error sending packet clientbound/minecraft:set_objective (skippable? false)
io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:set_objective'
at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:20) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:26) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:12) ~[paper-1.21.jar:1.21-130-b1b5d4c]
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:762) ~[paper-1.21.jar:1.21-130-b1b5d4c]
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 Vulcan-2.9.1.jar/io.github.repooper.packetevents.injector.modern.PlayerChannelHandlerModern.write(PlayerChannelHandlerModern.java:61) ~[Vulcan-2.9.1.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.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 ModelEngine-4.0.7.jar/com.ticxo.modelengine.v1_21_R1.network.ModelEngineChannelHandler.write(ModelEngineChannelHandler.java:110) ~[ModelEngine-4.0.7.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 v4.1.8.jar/me.neznamy.tab.shared.features.injection.NettyPipelineInjector$TabChannelDuplexHandler.write(NettyPipelineInjector.java:115) ~[TAB v4.1.8.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.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:513) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.Connection.lambda$sendPacket$13(Connection.java:498) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at ProtocolLib.jar/com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.lambda$proxyRunnable$2(NettyEventLoopProxy.java:49) ~[ProtocolLib.jar:?]
at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java: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.ClassCastException: class java.lang.Object cannot be cast to class net.minecraft.network.chat.numbers.NumberFormat (java.lang.Object is in module java.base of loader 'bootstrap'; net.minecraft.network.chat.numbers.NumberFormat is in unnamed module of loader java.net.URLClassLoader @41cf53f9)
at net.minecraft.network.codec.StreamCodec$6.encode(StreamCodec.java:104) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.codec.ByteBufCodecs$18.encode(ByteBufCodecs.java:363) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.codec.ByteBufCodecs$18.encode(ByteBufCodecs.java:353) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.protocol.game.ClientboundSetObjectivePacket.write(ClientboundSetObjectivePacket.java:57) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.codec.StreamCodec$2.encode(StreamCodec.java:38) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:88) ~[paper-1.21.jar:1.21-130-b1b5d4c]
at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:78) ~[paper-1.21.jar:1.21-130-b1b5d4c]
... 57 more
[21:26:04 INFO]: AMtopG joined the game
[21:26:04 INFO]: AMtopG[/158.58.202.190:51860] logged in with entity id 94 at ([world]-1051.2892401974702, 100.0, -394.69833107826236)
[21:26:04 INFO]: AMtopG lost connection: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:set_objective'
[21:26:05 INFO]: AMtopG left the game

[20:27:08 INFO]: [connected player] AMtopG (/158.58.202.190:50960) has connected
[20:27:13 ERROR]: [connected player] AMtopG (/158.58.202.190:50960): unable to connect to server hub
io.netty.channel.ConnectTimeoutException: connection timed out after 5000 ms: /158.58.202.190:25568
at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe$2.run(AbstractEpollChannel.java:613) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:153) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:416) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[velocity.jar:3.4.0-SNAPSHOT (git-ef1f5009-b438)]
at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
[20:27:13 INFO]: [connected player] AMtopG (/158.58.202.190:50960) has disconnected: You have been kicked from the server for the following reason: null

This is most likely a problem related to SimpleScore try to remove the plugin and see check if it works?