Sponge Error 2

---- Minecraft Crash Report ----

WARNING: coremods are present:
  SpongeCoremod (spongeforge-1.8-1521-2.1-DEV-739.jar)
Contact their authors BEFORE contacting forge

// But it works on my machine.

Time: 10/25/15 7:01 AM
Description: Exception in server tick loop

java.lang.UnsupportedOperationException
	at java.util.concurrent.CopyOnWriteArrayList$COWIterator.set(Unknown Source)
	at java.util.Collections.sort(Unknown Source)
	at org.spongepowered.common.data.SpongeDataRegistry.lambda$finalizeRegistration$68(SpongeDataRegistry.java:121)
	at org.spongepowered.common.data.SpongeDataRegistry$$Lambda$52/1104872519.accept(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap$EntrySetView.forEach(Unknown Source)
	at org.spongepowered.common.data.SpongeDataRegistry.finalizeRegistration(SpongeDataRegistry.java:119)
	at org.spongepowered.common.registry.SpongeGameRegistry.postInit(SpongeGameRegistry.java:2144)
	at org.spongepowered.mod.registry.SpongeModGameRegistry.postInit(SpongeModGameRegistry.java:91)
	at org.spongepowered.common.SpongeBootstrap.postInitializeRegistry(SpongeBootstrap.java:128)
	at org.spongepowered.mod.SpongeMod.onPostInitialization(SpongeMod.java:214)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
	at com.google.common.eventbus.EventBus.post(EventBus.java:275)
	at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
	at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
	at com.google.common.eventbus.EventBus.post(EventBus.java:275)
	at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
	at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:736)
	at net.minecraftforge.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)
	at net.minecraftforge.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:360)
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:210)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
	at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 1.8
	Operating System: Linux (amd64) version 3.14.32-xxxx-grs-ipv6-64
	Java Version: 1.8.0_05, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 2900057792 bytes (2765 MB) / 3087007744 bytes (2944 MB) up to 3087007744 bytes (2944 MB)
	JVM Flags: 2 total; -Xmx3072M -Xms3072M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1521 5 mods loaded, 5 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
	UCHIJ	mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
	UCHIJ	FML{8.0.99.99} [Forge Mod Loader] (forge.jar)
	UCHIJ	Forge{11.14.3.1521} [Minecraft Forge] (forge.jar)
	UCHIE	Sponge{1.8-1521-2.1-DEV-739} [SpongeForge] (minecraft.jar)
	UCHIJ	Dynmap{2.3-alpha-1-69} [Dynmap] (Dynmap-HEAD-forge-1.8.0.jar)
	Loaded coremods (and transformers):
SpongeCoremod (spongeforge-1.8-1521-2.1-DEV-739.jar)

	Profiler Position: N/A (disabled)
	Is Modded: Definitely; Server brand changed to 'fml,forge,SpongeForge'
	Type: Dedicated Server (map_server.txt)