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When i open up my minecraft it seems to load fine with all the mods and can create a new world but when it loads the world it crashes with this error message:

Description: Ticking memory connection

java.lang.IllegalArgumentException: Duplicate id value for 27!
at net.minecraft.entity.DataWatcher.func_75682_a(SourceFile:64)
at ckathode.weaponmod.PlayerWeaponData.initPlayerWeaponData(PlayerWeaponData.java:33)
at ckathode.weaponmod.WMCommonEventHandler.onEntityConstructed(WMCommonEventHandler.java:14)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_184_WMCommonEventHandler_onEntityConstructed_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>(EntityPlayer.java:141)
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:186)
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 ckathode.weaponmod.PlayerWeaponData.initPlayerWeaponData(PlayerWeaponData.java:33)
at ckathode.weaponmod.WMCommonEventHandler.onEntityConstructed(WMCommonEventHandler.java:14)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_184_WMCommonEventHandler_onEntityConstructed_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>(EntityPlayer.java:141)
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:186)
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: 1.7.0_79, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 395438920 bytes (377 MB) / 872460288 bytes (832 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 25, tallocated: 350
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 Optifine OptiFine_1.7.10_HD_U_D6 26 mods loaded, 26 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 FLabsBF{4.3} [Better Furnaces] ([1.7.10]Better_Furnaces_V4.3.jar)
UCHIJAAAA bspkrsCore{6.16} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.16.jar)
UCHIJAAAA Treecapitator{1.7.10} [Treecapitator] ([1.7.10]Treecapitator-universal-2.0.4.jar)
UCHIJAAAA Backpack{2.0.1} [Backpack] (backpack-2.0.1-1.7.x.jar)
UCHIJAAAA BiblioCraft{1.11.5} [BiblioCraft] (BiblioCraft[v1.11.5][MC1.7.10].jar)
UCHIJAAAA BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1889-universal.jar)
UCHIJAAAA chocolateQuest{1.0} [Chocolate Quest] (chocolateQuest-1.7.10-1.0.jar)
UCHIJAAAA DamageIndicatorsMod{3.2.0} [Damage Indicators] (Damage-Indicators-Mod-1.7.10.jar)
UCHIJAAAA MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip)
UCHIJAAAA eplus{3.0.2-d} [Enchanting Plus] (EnchantingPlus-1.7.10-3.0.2-d.jar)
UCHIJAAAA eternalfrost{2.0b4} [Eternal Frost] (eternalfrost-2.0b6.jar)
UCHIJAAAA IronChest{6.0.60.741} [Iron Chest] (ironchest-1.7.10-6.0.60.741-universal.jar)
UCHIJAAAA MetallurgyCore{4.0.5} [Metallurgy Core] (MetallurgyCore-1.7.10-4.0.5.30.jar)
UCHIJAAAA Metallurgy{4.0.9} [Metallurgy 4] (Metallurgy-1.7.10-4.0.9.148.jar)
UCHIJAAAA MSM3{3.0.0d} [More Swords 3] (MSM-SNAP-3.0.0e-For-MC-1.7.10.jar)
UCHIJAAAA nevermine{1.1.1} [Nevermine] (nevermine-1.1.6H_for_mc1.7.10.jar)
UCHIJAAAA OreSpawn{1.7.10.20.3} [OreSpawn] (orespawn-1.7.10-20.3.zip)
UCHIJAAAA harvestcraft{1.7.10g} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10h.jar)
UCHIJAAAA ReiMinimap{1.7.10} [Rei's Minimap] (Reis-Minimap-Mod-1.7.10.jar)
UCHIJAAAA TwilightForest{2.3.7} [The Twilight Forest] (twilightforest-1.7.10-2.3.7.jar)
UCHIJAAAA UndergroundBiomes{0.8.beta49} [Underground Biomes Constructs] (UndergroundBiomesConstructs-1.7.10-0.8-beta49.jar)
UCHIJAAAA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJAAAA weaponmod{v1.14.3} [Balkon's WeaponMod] (weaponmod-1.14.3.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'
OptiFine Version: OptiFine_1.7.10_HD_U_D6
Render Distance Chunks: 10
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
OpenGlVersion: 4.5.0 NVIDIA 372.54
OpenGlRenderer: GeForce GTX 960M/PCIe/SSE2
OpenGlVendor: NVIDIA Corporation
CpuCount: 8

Pls help me ASAP

Also i already update my drivers and downgraded java

Try installing your mods ONE-BY-ONE.

Thanks i found the problem and its fixed

Quote from Pbtopacio»

Thanks i found the problem and its fixed