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java.lang.UnsupportedOperationException: 	at java.util.AbstractList.remove(Unknown Source)	at java.util.AbstractList$Itr.remove(Unknown Source)	at org.spongepowered.api.event.entity.AffectEntityEvent.filterEntities(AffectEntityEvent.java:101)	at me.ryanhamshire.griefprevention.event.EntityEventHandler.onEntitySpawn(EntityEventHandler.java:175)	at org.spongepowered.common.event.listener.SpawnEntityEventListener_EntityEventHandler_onEntitySpawn161.handle(Unknown Source)	at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95)	at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:349)	at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:332)	at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:377)	at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:362)	at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:138)	at org.spongepowered.common.event.tracking.phase.TrackingPhase.spawnEntityOrCapture(TrackingPhase.java:290)	at org.spongepowered.common.event.tracking.CauseTracker.spawnEntity(CauseTracker.java:497)	at net.minecraft.world.WorldServer.func_72838_d(WorldServer.java:983)	at lellson.roughMobs.events.ZombieEvents.setHorse(ZombieEvents.java:177)	at lellson.roughMobs.events.ZombieEvents.onWorldJoin(ZombieEvents.java:161)	at lellson.roughMobs.events.ZombieEvents.onWorldJoin(ZombieEvents.java:33)	at lellson.roughMobs.events.DefaultEvents.eventJoinWorld(DefaultEvents.java:85)	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_75_DefaultEvents_eventJoinWorld_EntityJoinWorldEvent.invoke(.dynamic)	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:72)	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:131)	at org.spongepowered.mod.event.SpongeForgeEventFactory.callEntityJoinWorldEvent(SpongeForgeEventFactory.java:979)	at org.spongepowered.mod.event.SpongeForgeEventFactory.callForgeEvent(SpongeForgeEventFactory.java:425)	at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:325)	at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:377)	at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:362)	at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:138)	at org.spongepowered.common.event.tracking.phase.GenerationPhase$GeneralGenerationPhaseState.unwind(GenerationPhase.java:167)	at org.spongepowered.common.event.tracking.phase.GenerationPhase.unwind(GenerationPhase.java:239)	at org.spongepowered.common.event.tracking.CauseTracker.completePhase(CauseTracker.java:185)	at net.minecraft.world.WorldEntitySpawner.handler$onFindChunksForSpawningReturn$0(WorldEntitySpawner.java:115)	at net.minecraft.world.WorldEntitySpawner.func_77192_a(WorldEntitySpawner.java:183)	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:198)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:698)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)	at java.lang.Thread.run(Unknown Source)