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Hi I'de like some assistance with a world crashing problem I know there's a Duplicate of something I Just need to know how to find it.

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 11/2/16 2:48 PM
Description: Ticking memory connection

java.lang.IllegalArgumentException: Duplicate id value for 20!
at net.minecraft.entity.DataWatcher.func_75682_a(SourceFile:64)
at fantastic.events.PlayerInfo.<init>(PlayerInfo.java:25)
at fantastic.events.PlayerInfo.register(PlayerInfo.java:45)
at fantastic.events.FantasticEvents.onEntityConstructing(FantasticEvents.java:602)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_291_FantasticEvents_onEntityConstructing_EntityConstructing.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.entity.Entity.<init>(Entity.java:179)
at net.minecraft.entity.EntityLivingBase.<init>(EntityLivingBase.java:119)
at net.minecraft.entity.player.EntityPlayer.<init>(Unknown Source)
at net.minecraft.entity.player.EntityPlayerMP.<init>(EntityPlayerMP.java:138)
at net.minecraft.server.management.ServerConfigurationManager.func_148545_a(ServerConfigurationManager.java:410)
at net.minecraft.server.network.NetHandlerLoginServer.func_147326_c(NetHandlerLoginServer.java:101)
at net.minecraft.server.network.NetHandlerLoginServer.func_147233_a(NetHandlerLoginServer.java:60)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:215)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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

-- Head --
Stacktrace:
at net.minecraft.entity.DataWatcher.func_75682_a(SourceFile:64)
at fantastic.events.PlayerInfo.<init>(PlayerInfo.java:25)
at fantastic.events.PlayerInfo.register(PlayerInfo.java:45)
at fantastic.events.FantasticEvents.onEntityConstructing(FantasticEvents.java:602)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_291_FantasticEvents_onEntityConstructing_EntityConstructing.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.entity.Entity.<init>(Entity.java:179)
at net.minecraft.entity.EntityLivingBase.<init>(EntityLivingBase.java:119)
at net.minecraft.entity.player.EntityPlayer.<init>(Unknown Source)
at net.minecraft.entity.player.EntityPlayerMP.<init>(EntityPlayerMP.java:138)
at net.minecraft.server.management.ServerConfigurationManager.func_148545_a(ServerConfigurationManager.java:410)
at net.minecraft.server.network.NetHandlerLoginServer.func_147326_c(NetHandlerLoginServer.java:101)
at net.minecraft.server.network.NetHandlerLoginServer.func_147233_a(NetHandlerLoginServer.java:60)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:215)

-- Ticking connection --
Details:
Connection: [email protected]
Stacktrace:
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 415386264 bytes (396 MB) / 1150210048 bytes (1096 MB) up to 5355339776 bytes (5107 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx5G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 15, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 65 mods loaded, 65 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{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJAAAA TooManyItems{1.7.10} [TooManyItems] (minecraft.jar)
UCHIJAAAA VeinMiner_coremod{0.26.0_build.unknown} [Core mod] (minecraft.jar)
UCHIJAAAA battlegear2{1.7.10} [Mine & Blade Battlegear 2 - Bullseye] (1.7.10-MB_Battlegear2-Bullseye-1.0.8.0.jar)
UCHIJAAAA MCP_API{1.4} [MC+ API] ([1.7.10][1.4] MC+ API.jar)
UCHIJAAAA MCP_Wheel{1.1.2} [MC+ Wheel] ([1.7.10][1.4] MC+ Wheel - v1.1.2.jar)
UCHIJAAAA MCP_Loom{1.2.3} [MC+ Loom] ([1.7.10][1.4] MC+ Loom - v1.2.3.jar)
UCHIJAAAA ArchimedesShips{1.7.10 v1.7.1} [Archimedes' Ships] (ArchimedesShips-1.7.1.jar)
UCHIJAAAA Backpack{2.0.1} [Backpack] (Backpacks-Mod.jar)
UCHIJAAAA BetterFoliage{1.0.14} [Better Foliage] (BetterFoliage-mc1.7-1.0.14.jar)
UCHIJAAAA BiblioCraft{1.7.3} [BiblioCraft] (BiblioCraft-Mod-1.7.10.jar)
UCHIJAAAA Cyan Warrior Swords Mod{2.1.1} [Cyan Warrior Swords Mod] (Cyan_Warrior_Swords_Mod_v.2.1.1.jar)
UCHIJAAAA props{2.0.2} [Decocraft] (Decocraft-2.0.2_1.7.10.jar)
UCHIJAAAA deconstruction{2.2.5} [The Deconstruction Mod] (Deconstruction-Table-Mod-1.7.10.jar)
UCHIJAAAA grim3212core{V0.2 - 1.7.10} [Grim3212 Core] (Grim3212-Core-1.7.10.jar)
UCHIJAAAA doubledoors{V0.1 - 1.7.10} [Double Doors] (Double-doors-mod-by-derbam-1.7.10.jar)
UCHIJAAAA DragonMounts{r41-1.7.10} [Dragon Mounts] (DragonMounts-r41-1.7.10.jar)
UCHIJAAAA MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1 (1).zip)
UCHIJAAAA DynamicLights{1.3.9} [Dynamic Lights] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_onFire{1.0.5} [Dynamic Lights Burning Entity Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_creepers{1.0.4} [Dynamic Lights Creeper Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_dropItems{1.0.8} [Dynamic Lights EntityItem Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_entityClasses{1.0.1} [Dynamic Lights Entity Light Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_mobEquipment{1.0.8} [Dynamic Lights Mob Equipment Light Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_flameArrows{1.0.0} [Dynamic Lights Fiery Arrows Light Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_floodLights{1.0.2} [Dynamic Lights Flood Light] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_otherPlayers{1.0.8} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_thePlayer{1.1.4} [Dynamic Lights Player Light Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA eplus{3.0.2-d} [Enchanting Plus] (Enchanting-Plus-Mod-1.7.10.jar)
UCHIJAAAA exoticbirds{1.0} [Exotic Birds] (Exotic Birds 1.7.10 - 1.0.3b.jar)
UCHIJAAAA fantastic{1.0.0} [Fantastic Fish] (fantastic-1.4.jar)
UCHIJAAAA foxlib{1.7.10-0.7.0} [FoxLib] (FoxLib-1.7.10-0.7.0 (1).jar)
UCHIJAAAA KeepingInventory{1.6} [Keeping Inventory] (Keeping-Inventory-Mod-1.7.10.jar)
UCHIJAAAA malisiscore{1.7.10-0.13.1} [MalisisCore] (malisiscore-1.7.10-0.13.1.jar)
UCHIJAAAA malisisdoors{1.7.10-1.13.2} [Malisis' Doors] (malisisdoors-1.7.10-1.13.2.jar)
UCHIJAAAA RadixCore{2.1.1} [RadixCore] (RadixCore-1.7.10-2.1.1-universal.jar)
UCHIJAAAA MCA{1.7.10-5.1.2} [Minecraft Comes Alive] (MCA-1.7.10-5.1.2-universal (1).jar)
UCHIJAAAA moreplayermodels{1.7.10b} [MorePlayerModels] (MorePlayerModels_1.7.10b.jar)
UCHIJAAAA movillages{1.2.1} [Mo' Villages] (MoVillages-1.3.1.jar)
UCHIJAAAA cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10) (1).jar)
UCHIJAAAA MultiPageChest{1.3.4} [Multi Page Chest] (Multi-Page-Chest-Mod-1.7.10.jar)
UCHIJAAAA powerinventory{2.0.0} [Overpowered Inventory] (OverpoweredInventory-1.7.10-2.0.0.jar)
UCHIJAAAA Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UCHIJAAAA Thaumcraft{4.2.2.1} [Thaumcraft] (Thaumcraft-1.7.10-4.2.2.1.jar)
UCHIJAAAA harvestcraft{1.7.10j} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10j.jar)
UCHIJAAAA pandorasbox{2.0.1} [Pandora's Box] (PandorasBox-2.1.jar)
UCHIJAAAA plantmegapack{4.02} [Plant Mega Pack] (Plant-Mega-Pack-Mod-1.7.10.jar)
UCHIJAAAA Railcraft{9.6.1.0} [Railcraft] (Railcraft_1.7.10-9.6.1.0.jar)
UCHIJAAAA RandomThings{2.2.4} [Random Things] (RandomThings-2.2.4.jar)
UCHIJAAAA RedstonePasteMod{1.6.2} [Redstone Paste] (RedstonePasteMod-1.7.10-1.6.2.jar)
UCHIJAAAA rideAbleSpidersMod{1.3} [Rideable SpidersMod] (Rideablespiders-1.3-1.7.10.jar)
UCHIJAAAA secretroomsmod{4.7.1} [The SecretRoomsMod] (secretroomsmod-1.7.10-4.7.1.386.jar)
UCHIJAAAA DP_SimpleFlight{0.8} [Simple Flight] (Simple-Flight-Mod-1.7.10.jar)
UCHIJAAAA Tails{1.7.10-1.4.1a} [Tails] (Tails-1.7.10-1.4.1a (1).jar)
UCHIJAAAA TF2Teleporter{1.7.10} [TF2 Teleporter] (TF2Teleporter-1.7.10.jar)
UCHIJAAAA AS_UpdateCheck{1.1.6} [AtomicStryker Update Check Mod] (UpdateCheckerMod-1.7.10.jar)
UCHIJAAAA VeinMiner{0.26.0_build.unknown} [Vein Miner] (Vein-Miner-Mod-1.7.10.jar)
UCHIJAAAA VeinMinerModSupport{0.26.0_build.unknown} [Mod Support] (Vein-Miner-Mod-1.7.10.jar)
UCHIJAAAA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJAAAA worldedit{6.0-beta-01} [WorldEdit] (worldedit-forge-mc1.7.10-6.0-beta-01.jar)
UCHIJAAAA bspkrsCore{6.15} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.15.jar)
UCHIJAAAA GollumCoreLib{2.0.0} [Gollum Core Lib] (Gollum-Core-Lib-1.7.10.jar)
UCHIJAAAA SlimevoidLib{2.0.4.7} [Slimevoid Library] (SlimevoidLibrary-2.0.4.7 (1).jar)
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

thx