Spongeforge always skip entity,and Negative bug

The entity is player’s pet…
MOD use “Digimobs 0.98a” Sponge use the lastest version
when sever create a entity. spongeforge always skip it…
But this problem doesn’t appear spongeforge before
1.8.9_ spongeforge 4.2.0 1547 build and 1.10.2_spongeforge 5.0.0 1560 build

another problem negative item…Can be unlimited use…

Can you pastebvin the full stacktrace for the exception?

This problem isn’t make server crash…

logs pastbin

In order to use Commandsign i use spongeforge Build Spongeforge 1.10.2 6.0.0-BETA-1878
but this problem is also appear the lastest version…

fml-latest 
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:150)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
[14:05:53] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at java.lang.Thread.run(Unknown Source)
[14:05:53] [Netty Server IO #3/ERROR] [Sponge/]: Detected attempt to add entity 'EntityKoromon['Koromon'/111979, l='DIM8', x=-509.46, y=74.00, z=-883.85]' to tracker asynchronously.
 This is very bad as it can cause ConcurrentModificationException's during a server tick.
 Skipping...
[14:05:57] [Netty Server IO #1/TRACE] [FML/]: Handshake channel activating
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]: FMLHandshakeServerState: null->FMLHandshakeServerState$1:START
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]:   Next: HELLO
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]: FMLHandshakeServerState: $ClientHello->FMLHandshakeServerState$2:HELLO
[14:05:57] [Netty Server IO #1/INFO] [FML/]: Client protocol version 2
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]:   Next: HELLO
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]: FMLHandshakeServerState: $ModList:17 mods->FMLHandshakeServerState$2:HELLO
[14:05:57] [Netty Server IO #1/INFO] [FML/]: Client attempting to join with 17 mods : [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],shouldersurfing@v1,[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
[14:05:57] [Netty Server IO #1/INFO] [FML/]: Attempting connection with missing mods [spongeapi, sponge, actionbroadcaster, adminshop, catclearlag, cmdkits, commandsigns, economylite, io.github.hsyyid.essentialcmds, keys, io.github.hsyyid.kits, mercurius_updater, mmcreboot, ninja.leaping.permissionsex, pixelvip, playershops, plotsquared, blue.lapis.pore, redprotect, stackban, tmotd] at CLIENT
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]:   Next: WAITINGCACK
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]: FMLHandshakeServerState: $HandshakeAck:{2}->FMLHandshakeServerState$3:WAITINGCACK
[14:05:57] [Netty Server IO #1/DEBUG] [FML/]:   Next: COMPLETE
[14:05:58] [Netty Server IO #1/DEBUG] [FML/]: FMLHandshakeServerState: $HandshakeAck:{3}->FMLHandshakeServerState$4:COMPLETE
[14:05:58] [Netty Server IO #1/DEBUG] [FML/]:   Next: DONE
[14:05:58] [Netty Server IO #1/DEBUG] [FML/]: FMLHandshakeServerState: $HandshakeAck:{4}->FMLHandshakeServerState$5:DONE
[14:05:58] [Netty Server IO #1/DEBUG] [FML/]:   Next: DONE
[14:05:58] [Server thread/INFO] [FML/]: [Server thread] Server side modded connection established
[14:05:58] [Server thread/INFO] [pore.Fcac/]: 开始验证事件,游戏名:KG_wufan
[14:05:58] [Netty Server IO #1/DEBUG] [FML/]: FMLHandshakeServerState: $HandshakeAck:{5}->FMLHandshakeServerState$5:DONE
[14:05:58] [Netty Server IO #1/DEBUG] [FML/]:   Next: DONE
[14:05:58] [HikariPool-1 housekeeper/DEBUG] [com.zaxxer.hikari.pool.HikariPool/sponge]: HikariPool-1 - Pool stats (total=9, active=2, idle=7, waiting=0)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: java.lang.Exception: Stack trace
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at java.lang.Thread.dumpStack(Unknown Source)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.entity.EntityTracker.handler$onAddEntityToTracker$zda000(EntityTracker.java:76)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.entity.EntityTracker.func_72785_a(EntityTracker.java)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraftforge.fml.common.registry.EntityRegistry.tryTrackingEntity(EntityRegistry.java:360)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.entity.EntityTracker.func_72786_a(EntityTracker.java:78)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.world.ServerWorldEventHandler.func_72703_a(ServerWorldEventHandler.java:33)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.world.World.func_72923_a(World.java:1142)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.world.WorldServer.func_72923_a(WorldServer.java:1117)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.world.WorldServer.onSpongeEntityAdded(WorldServer.java:1375)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.world.WorldServer.forceSpawnEntity(WorldServer.java:1421)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.world.WorldServer.forceSpawnEntity(WorldServer.java:1404)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at org.spongepowered.common.event.tracking.phase.tick.PlayerTickPhaseState.spawnEntityOrCapture(PlayerTickPhaseState.java:130)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at org.spongepowered.common.event.tracking.phase.tick.TickPhase.spawnEntityOrCapture(TickPhase.java:83)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at org.spongepowered.common.event.tracking.CauseTracker.spawnEntity(CauseTracker.java:522)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.world.WorldServer.func_72838_d(WorldServer.java:1152)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at digimobs.ModBase.DigimobsPlayer.getChosenDigimon(DigimobsPlayer.java:124)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at digimobs.Packets.ChosenMessage$Handler.onMessage(ChosenMessage.java:46)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at digimobs.Packets.ChosenMessage$Handler.onMessage(ChosenMessage.java:35)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraftforge.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:56)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraftforge.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:36)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraftforge.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:100)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:149)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:51)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.handleServerSideCustomPacket(NetworkDispatcher.java:446)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.channelRead0(NetworkDispatcher.java:269)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.channelRead0(NetworkDispatcher.java:73)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:150)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
[14:06:00] [Netty Server IO #3/INFO] [STDERR/]: [java.lang.Thread:dumpStack:-1]: 	at java.lang.Thread.run(Unknown Source)
[14:06:00] [Netty Server IO #3/ERROR] [Sponge/]: Detected attempt to add entity 'EntityKoromon['Koromon'/112290, l='DIM8', x=-508.77, y=74.00, z=-884.77]' to tracker asynchronously.
 This is very bad as it can cause ConcurrentModificationException's during a server tick.
 Skipping...
[14:06:04] [Netty Server IO #3/TRACE] [FML/]: Handshake channel activating

:sob::sob::sob: negative item… can be unlimited use…
How to solve it :cry:
You can see http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/wip-mods/1439034-wip-1-10-2-1-3-17-digimobs-0-9-8a-digimon-in
Digimobs mod
The author also said the same problem occurred in spongeforge
But this problem doesn’t appear spongeforge before 1.8.9_ spongeforge 4.2.0 1547 build and 1.10.2_spongeforge 5.0.0 1560 build

And why server create a lot of playerUUID.json?

Help me!
This must be spongeforge’s problem

The second stacktrace (e.g. the one that starts with java.lang.Exception: Stack trace) is caused by a bug in Didimobs. Tell the author that they shouldn’t be spawning in entiteis directly from a packet handler.

Negative items allowing unlimited use is a ‘bug’ that’s part of Vanilla. However, I can look into adding an option to Sponge to prevent them from being used.