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java.lang.UnsupportedOperationException at java.util.AbstractList.remove(AbstractList.java:161)[?:1.8.0_92] at java.util.AbstractList$Itr.remove(AbstractList.java:374)[?:1.8.0_92] at org.spongepowered.api.event.entity.AffectEntityEvent.filterEntities(AffectEntityEvent.java:101)[AffectEntityEvent.class:?] at modwiztesting.modwiztesting.Modwiztesting.onSpawn(Modwiztesting.java:24)[Modwiztesting.class:?] at org.spongepowered.common.event.listener.SpawnEntityEventListener_Modwiztesting_onSpawn1.handle(Unknown Source)[?:?] at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95)[RegisteredListener.class:?] at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:349)[SpongeModEventManager.class:?] at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:332)[SpongeModEventManager.class:?] at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:377)[SpongeModEventManager.class:?] at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:362)[SpongeModEventManager.class:?] at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:141)[SpongeImpl.class:?] at org.spongepowered.common.event.tracking.phase.TrackingPhase.spawnEntityOrCapture(TrackingPhase.java:290)[TrackingPhase.class:?] at org.spongepowered.common.event.tracking.CauseTracker.spawnEntity(CauseTracker.java:497)[CauseTracker.class:?] at net.minecraft.world.WorldServer.spawnEntityInWorld(WorldServer.java:1006)[WorldServer.class:?] at net.minecraft.world.WorldServer.updateBlocks(WorldServer.java:530)[WorldServer.class:?] at net.minecraft.world.WorldServer.tick(WorldServer.java:228)[WorldServer.class:?] at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:772)[MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687)[MinecraftServer.class:?] at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)[IntegratedServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536)[MinecraftServer.class:?] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_92]