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I crash at least once each time I'm playing but I can't figure out why. Im pretty sure all of the mods are working fine. Here's my crash report someone please help btw I'm on mac and on forge 1.8-11.14.3.1521

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Hey, that tickles! Hehehe!

Time: 10/27/15 11:37 PM
Description: Exception ticking world

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
at com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection$WrappedIterator.next(AbstractMapBasedMultimap.java:486)
at net.minecraft.util.ClassInheritanceMultiMap$2.computeNext(SourceFile:90)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at net.minecraft.world.World.func_175650_b(World.java:3126)
at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:952)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:46)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)
at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)
at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:117)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:92)
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:189)
at net.minecraft.world.World.func_72964_e(World.java:304)
at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:380)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:221)
at WorldServerOF.func_72835_b(WorldServerOF.java:37)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:693)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:258)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478)
at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Stacktrace:
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
at com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection$WrappedIterator.next(AbstractMapBasedMultimap.java:486)
at net.minecraft.util.ClassInheritanceMultiMap$2.computeNext(SourceFile:90)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at net.minecraft.world.World.func_175650_b(World.java:3126)
at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:952)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:46)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)
at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)
at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:117)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:92)
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:189)
at net.minecraft.world.World.func_72964_e(World.java:304)
at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:380)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:221)
at WorldServerOF.func_72835_b(WorldServerOF.java:37)

-- Affected level --
Details:
Level name: Alan's World
All players: 1 total; [EntityPlayerMP['ALANVILLANUEVA'/379, l='Alan's World', x=-31.90, y=65.00, z=234.79]]
Chunk stats: ServerChunkCache: 471 Drop: 0
Level seed: 8103860503549665447
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: 96.00,64.00,256.00 - World: (96,64,256), Chunk: (at 0,4,0 in 6,16; contains blocks 96,0,256 to 111,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 25599 game time, 35639 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 18816 (now: false), thunder time: 6838 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:693)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:258)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478)
at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Mac OS X (x86_64) version 10.10.5
Java Version: 1.8.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 282552608 bytes (269 MB) / 1041002496 bytes (992 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1521 Optifine OptiFine_1.8_HD_U_D5 10 mods loaded, 10 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.3.1521.jar)
UCHIJAAAA Forge{11.14.3.1521} [Minecraft Forge] (forge-1.8-11.14.3.1521.jar)
UCHIJAAAA AnimalsPlus{1.4} [Animals Plus] (animalsplus-1.4.jar)
UCHIJAAAA butterflymania{1.5.3} [Butterfly Mania] (butterflymania-1.8-1.5.3.jar)
UCHIJAAAA decorationmegapack{1.25} [Decoration Mega Pack] (decorationmegapack-1.25-1.8-1450.jar)
UCHIJAAAA oldguns{1.3.0} [Old Guns Mod] (oldguns-1.4.0_x32.jar)
UCHIJAAAA plantmegapack{5.12} [Plant Mega Pack] (plantmegapack-5.12-1.8-1450.jar)
UCHIJAAAA corerm{1.2c} [RikMuld's Core] (RikMuldsCore_1.2c.jar)
UCHIJAAAA camping{2.2e} [The Camping Mod 2] (TheCampingMod_2.2e.jar)
Loaded coremods (and transformers):
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['ALANVILLANUEVA'/379, l='Alan's World', x=-31.90, y=65.00, z=234.79]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'