Error

17:08:53Detected attempt to add entity 'EntityPlayerMP['xCrimsonMoon'/228, l='world', x=8446.50, y=75.00, z=7934.50]' to ClassInheritanceMultiMap asynchronously.
Console 31. 07. 2019 17:08:53
17:08:53 This is very bad as it can cause ConcurrentModificationException's during a server tick.
Skipping...
Netty Server IO #3/INFO 31. 07. 2019 17:08:53
17:08:53[java.lang.Thread:dumpStack:1336]: java.lang.Exception: Stack trace
[java.lang.Thread:dumpStack:1336]: at java.lang.Thread.dumpStack(Thread.java:1336)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.util.ClassInheritanceMultiMap.handler$concurrentCheck$checkServerThreadedSide$zbc000(ClassInheritanceMultiMap.java:543)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.util.ClassInheritanceMultiMap.func_181743_a(ClassInheritanceMultiMap.java)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.util.ClassInheritanceMultiMap.add(ClassInheritanceMultiMap.java:73)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.world.chunk.Chunk.func_76612_a(Chunk.java:744)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.world.World.redirect$impl$returnTrueToAddedToChunkForMovingEntities$zlp000(World.java:8654)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.world.World.func_72866_a(World.java:2030)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.entity.Entity.func_70107_b(Entity.java:359)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.entity.Entity.redirect$chunkLoadPositionReset$onSetPositionMarkWorldChunkAsLoaded$znp000(Entity.java:7531)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.entity.Entity.func_70080_a(Entity.java:1401)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.network.NetHandlerPlayServer.func_175089_a(NetHandlerPlayServer.java:626)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.network.NetHandlerPlayServer.func_147364_a(NetHandlerPlayServer.java:598)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.entity.player.EntityPlayerMP.func_70634_a(EntityPlayerMP.java:1220)
[java.lang.Thread:dumpStack:1336]: at xyz.vsngamer.elevator.network.TeleportHandler.onMessage(TeleportHandler.java:35)
[java.lang.Thread:dumpStack:1336]: at xyz.vsngamer.elevator.network.TeleportHandler.onMessage(TeleportHandler.java:17)
[java.lang.Thread:dumpStack:1336]: at net.minecraftforge.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:56)
[java.lang.Thread:dumpStack:1336]: at net.minecraftforge.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:36)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
[java.lang.Thread:dumpStack:1336]: at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
[java.lang.Thread:dumpStack:1336]: at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1421)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:342)
[java.lang.Thread:dumpStack:1336]: at net.minecraftforge.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:99)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:147)
[java.lang.Thread:dumpStack:1336]: at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:49)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
[java.lang.Thread:dumpStack:1336]: at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.handleServerSideCustomPacket(NetworkDispatcher.java:452)
[java.lang.Thread:dumpStack:1336]: at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.channelRead0(NetworkDispatcher.java:264)
[java.lang.Thread:dumpStack:1336]: at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.channelRead0(NetworkDispatcher.java:72)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
[java.lang.Thread:dumpStack:1336]: at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:328)
[java.lang.Thread:dumpStack:1336]: at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:302)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
[java.lang.Thread:dumpStack:1336]: at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:328)
[java.lang.Thread:dumpStack:1336]: at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:302)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
[java.lang.Thread:dumpStack:1336]: at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:287)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1421)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:930)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:697)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:632)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:549)
[java.lang.Thread:dumpStack:1336]: at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:511)
[java.lang.Thread:dumpStack:1336]: at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:918)
[java.lang.Thread:dumpStack:1336]: at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[java.lang.Thread:dumpStack:1336]: at java.lang.Thread.run(Thread.java:748)