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here's the crash report:

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 8/7/16 3:33 PM
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_556_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>(Unknown Source)
at net.minecraft.entity.player.EntityPlayerMP.<init>(EntityPlayerMP.java:138)
at thebetweenlands.forgeevent.BLForgeHooks.createPlayerForUser(BLForgeHooks.java:60)
at net.minecraft.server.management.ServerConfigurationManager.func_148545_a(ServerConfigurationManager.java)
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 ckathode.weaponmod.PlayerWeaponData.initPlayerWeaponData(PlayerWeaponData.java:33)
at ckathode.weaponmod.WMCommonEventHandler.onEntityConstructed(WMCommonEventHandler.java:14)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_556_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>(Unknown Source)
at net.minecraft.entity.player.EntityPlayerMP.<init>(EntityPlayerMP.java:138)
at thebetweenlands.forgeevent.BLForgeHooks.createPlayerForUser(BLForgeHooks.java:60)
at net.minecraft.server.management.ServerConfigurationManager.func_148545_a(ServerConfigurationManager.java)
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_73, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1198912704 bytes (1143 MB) / 2600468480 bytes (2480 MB) up to 2600468480 bytes (2480 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms2560m -Xmx2560m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 96
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 74 mods loaded, 74 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] (modpack.jar)
UCHIJAAAA Forge{10.13.4.1614} [Minecraft Forge] (modpack.jar)
UCHIJAAAA AM2-Preloader{0.0.3} [AMCore] (minecraft.jar)
UCHIJAAAA CodeChickenCore{1.0.7.46} [CodeChicken Core] (minecraft.jar)
UCHIJAAAA NotEnoughItems{1.0.5.110} [Not Enough Items] (NotEnoughItems 1.0.5.110.jar)
UCHIJAAAA PlayerAPI{1.4} [Player API] (minecraft.jar)
UCHIJAAAA coloredlightscore{1.3.7.39} [Colored Lights Core] (minecraft.jar)
UCHIJAAAA mod_ThreadedLighting{1.7.10-1.0} [Threaded Lighting] (minecraft.jar)
UCHIJAAAA gilded-games-util{1.7.10-1.2} [Gilded Games Utility] (gilded-games-util 1.9.jar)
UCHIJAAAA crazyores{2.0.7} [CrazyOres] ([1.7.10]CrazyOres V2.0.7.jar)
UCHIJAAAA abyssalcraft{1.9.1.3} [AbyssalCraft] (AbyssalCraft-1.7.10-1.9.1.3-FINAL.jar)
UCHIJAAAA Baubles{1.0.1.10} [Baubles] (Baubles 1.0.1.10.jar)
UCHIJAAAA Enchiridion{1.3} [Enchiridion] (Enchiridion 2-1.7.10-2.0.2a.jar)
UCHIJAAAA adventurersamulets{1.7.10-1.5.0c} [Adventurer's Amulets] (AdventurersAmulets 1.5.0c.jar)
UCHIJAAAA aether{1.7.10-1.6} [Aether II] (aether 1.6.jar)
UCHIJAAAA AnimationAPI{1.2.4} [AnimationAPI] (AnimationAPI-1.7.10-1.2.4.jar)
UCHIJAAAA nevermine{2.3} [AdventOfAscension] (AoA-2.4.B.jar)
UCHIJAAAA arsmagica2{1.4.0.009} [Ars Magica 2] (Ars Magica 2 1.4.0.009.jar)
UCHIJAAAA Artifacts{1.1.3} [Artifacts] (Artifacts-1.1.3.jar)
UCHIJAAAA atum{0.6} [Atum] (Atum 0.6.77.jar)
UCHIJAAAA weaponmod{v1.14.3} [Balkon's WeaponMod] (Balkon's Weaponmod 1.14.3.jar)
UCHIJAAAA battlegear2{1.7.10} [Mine & Blade Battlegear 2 - Bullseye] (Battlegear 2 1.0.8.3.jar)
UCHIJAAAA Mantle{1.7.10-0.3.2.jenkins191} [Mantle] (Mantle-Mod.jar)
UCHIJAAAA Natura{2.2.0} [Natura] (Natura.jar)
UCHIJAAAA BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty 2.1.0.2027-universal.jar)
UCHIJAAAA Botania{r1.8-249} [Botania] (Botania r1.8-249.jar)
UCHIJAAAA chocolateQuest{1.0} [Chocolate Quest] (Chocolate Quest 1.0.jar)
UCHIJAAAA easycoloredlights{1.3.7.39} [Easy Colored Lights] (ColoredLightsCore-1.3.7.39.jar)
UCHIJAAAA CraftHeraldry{1.1.3} [CraftHeraldry] (CraftHeraldry 1.1.3.jar)
UCHIJAAAA DragonMounts{r39} [Dragon Mounts] (Dragon-Mounts-Mod-1.7.10.jar)
UCHIJAAAA DynamicLights{1.3.7} [Dynamic Lights] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_onFire{1.0.4} [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{1.0.7} [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{1.0.7} [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{1.0.1} [Dynamic Lights Flood Light] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_otherPlayers{1.0.7} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA DynamicLights_thePlayer{1.1.3} [Dynamic Lights Player Light Module] (DynamicLights-1.7.10.jar)
UCHIJAAAA Enchiridion2{2.0.2a} [Enchiridion 2] (Enchiridion 2-1.7.10-2.0.2a.jar)
UCHIJAAAA EnderZoo{1.7.10-1.0.13.30} [Ender Zoo] (EnderZoo-1.7.10-1.0.13.30.jar)
UCHIJAAAA etfuturum{1.5.5} [Et Futurum] (Et Futurum-1.5.5.jar)
UCHIJAAAA ExtrabiomesXL{3.16.RC1} [ExtrabiomesXL] (ExtrabiomesXL 3.16.RC1.jar)
UCHIJAAAA foxlib{1.7.10-0.7.0} [FoxLib] (FoxLib-1.7.10-0.7.0.jar)
UCHIJAAAA GrimoireOfGaia{1.0.0} [Grimoire of Gaia 3] (Grimiore of Gaia 3 1.2.7.jar)
UCHIJAAAA Growthcraft{2.1.0a} [Growthcraft] (growthcraft-core 2.1.0a.jar)
UCHIJAAAA Growthcraft|Cellar{2.1.0a} [Growthcraft Cellar] (growthcraft-cellar 2.1.0a.jar)
UCHIJAAAA Growthcraft|Apples{2.1.0} [Growthcraft Apples] (growthcraft-apples 2.1.0.jar)
UCHIJAAAA Growthcraft|Bamboo{2.1.0} [Growthcraft Bamboo] (growthcraft-bamboo 2.1.0.jar)
UCHIJAAAA Growthcraft|Bees{2.1.0} [Growthcraft Bees] (growthcraft-bees 2.1.0.jar)
UCHIJAAAA Growthcraft|Grapes{2.1.0} [Growthcraft Grapes] (growthcraft-grapes 2.1.0.jar)
UCHIJAAAA Growthcraft|Hops{2.1.0} [Growthcraft Hops] (growthcraft-hops 2.1.0.jar)
UCHIJAAAA Growthcraft|Rice{2.1.0a} [Growthcraft Rice] (growthcraft-rice 2.1.0a.jar)
UCHIJAAAA HardcoreEnderExpansion{1.8.5} [Hardcore Ender Expansion] (HardcoreEnderExpansion v1.8.5.jar)
UCHIJAAAA herdCraft{1.1} [HerdCraft] (HerdCraft-1.7.10-1.1.jar)
UCHIJAAAA InfernalMobs{1.6.0} [Infernal Mobs] (InfernalMobs-1.7.10.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 primitivemobs{1.0} [Primitive Mobs] (primitivemobs-1.0c-1.7.10.jar)
UCHIJAAAA Roguelike{1.5.0} [Roguelike Dungeons] (roguelike 1.5.0b.jar)
UCHIJAAAA runicdungeons{1.1.7b} [Runic Dungeons] (RunicDungeons-1.1.7b.jar)
UCHIJAAAA punt{1.7.10-10.13.0-16.1} [Punt] (smallboats-1.7.10-10.13.0-16.1.jar)
UCHIJAAAA whitehall{1.7.10-10.13.0-16.1} [Whitehall] (smallboats-1.7.10-10.13.0-16.1.jar)
UCHIJAAAA hoy{1.7.10-10.13.0-16.1} [Hoy] (smallboats-1.7.10-10.13.0-16.1.jar)
UCHIJAAAA smallboats{1.7.10-10.13.0-16.1} [SmallBoats (base)] (smallboats-1.7.10-10.13.0-16.1.jar)
UCHIJAAAA SpecialMobs{3.2.2} [Special Mobs] (SpecialMobs-1.7.10-3.2.2.jar)
UCHIJAAAA Tails{1.7.10-1.4.1a} [Tails] (Tails-1.7.10-1.4.1a.jar)
UCHIJAAAA thebetweenlands{1.0.6-alpha} [The Betweenlands] (TheBetweenlands-1.0.6-alpha-universal.jar)
UCHIJAAAA erebus{0.4.7} [Erebus] (TheErebus-0.4.7.jar)
UCHIJAAAA TwilightForest{2.3.7} [The Twilight Forest] (Twilight Forest 2.3.7.jar)
UCHIJAAAA AS_UpdateCheck{1.1.6} [AtomicStryker Update Check Mod] (UpdateCheckerMod.jar)
UCHIJAAAA witchery{0.24.1} [Witchery] (Witchery 0.24.1.jar)
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Mantle Environment: Environment healthy.
Hardcore Ender Expansion: CAUTION! Ars Magica 2 is not supported by HEE, if the crash is caused by a conflict of the two mods, it will very likely not be possible to fix.
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'

it's obviously an id conflict, i just want to know what mods it is, and no, it is not HEE and AM2 because it only happened after the addition of Biomes'o'Plenty and Advent of Ascension.

nope, only crashed once I added Biomes'o'Plenty and Advent of Ascension

Id conflict with betweenlands and what would seem to be weapon mod. maybe I am reading this wrong but check those config folders for an id of 27.

edit:

Quote from Darkpixel797»

nope, only crashed once I added Biomes'o'Plenty and Advent of Ascension

Also you seemingly know what crashed it so I would hope you could figure this out by looking at the two mods you added that started the crash.

well looks like im removing AoA because im not removing betweenlands anytime soon

removed AoA and it works