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I have a crash report its say something about custom Npcs

(spoiler)

---- Minecraft Crash Report ----
// I just don't know what went wrong

Time: 1/10/16 1:52 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at com.mrcrayfish.furniture.blocks.BlockShower.func_149719_a(BlockShower.java:115)
at net.minecraft.block.Block.func_149731_a(Block.java:712)
at net.minecraft.world.World.func_147447_a(World.java:1221)
at net.minecraft.world.World.func_72933_a(World.java:1024)
at net.minecraft.entity.EntityLivingBase.func_70685_l(EntityLivingBase.java:1908)
at net.minecraft.entity.ai.EntitySenses.func_75522_a(SourceFile:28)
at noppes.npcs.ai.selector.NPCAttackSelector.func_82704_a(NPCAttackSelector.java:36)
at net.minecraft.world.chunk.Chunk.func_76618_a(Chunk.java:1001)
at net.minecraft.world.World.func_82733_a(World.java:3230)
at noppes.npcs.ai.target.EntityAIClosestTarget.func_75250_a(EntityAIClosestTarget.java:56)
at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:70)
at net.minecraft.entity.EntityLiving.func_70619_bc(EntityLiving.java:537)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:1774)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:367)
at noppes.npcs.entity.EntityNPCInterface.func_70636_d(EntityNPCInterface.java:361)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1611)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)
at noppes.npcs.entity.EntityNPCInterface.func_70071_h_(EntityNPCInterface.java:246)
at noppes.npcs.entity.EntityCustomNpc.func_70071_h_(EntityCustomNpc.java:34)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)
at net.minecraft.world.World.func_72870_g(World.java:2034)
at WorldServerOF.func_72870_g(WorldServerOF.java:347)
at net.minecraft.world.World.func_72939_s(World.java:1887)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
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 com.mrcrayfish.furniture.blocks.BlockShower.func_149719_a(BlockShower.java:115)
at net.minecraft.block.Block.func_149731_a(Block.java:712)
at net.minecraft.world.World.func_147447_a(World.java:1221)
at net.minecraft.world.World.func_72933_a(World.java:1024)
at net.minecraft.entity.EntityLivingBase.func_70685_l(EntityLivingBase.java:1908)
at net.minecraft.entity.ai.EntitySenses.func_75522_a(SourceFile:28)
at noppes.npcs.ai.selector.NPCAttackSelector.func_82704_a(NPCAttackSelector.java:36)
at net.minecraft.world.chunk.Chunk.func_76618_a(Chunk.java:1001)
at net.minecraft.world.World.func_82733_a(World.java:3230)
at noppes.npcs.ai.target.EntityAIClosestTarget.func_75250_a(EntityAIClosestTarget.java:56)
at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:70)
at net.minecraft.entity.EntityLiving.func_70619_bc(EntityLiving.java:537)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:1774)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:367)
at noppes.npcs.entity.EntityNPCInterface.func_70636_d(EntityNPCInterface.java:361)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1611)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)
at noppes.npcs.entity.EntityNPCInterface.func_70071_h_(EntityNPCInterface.java:246)
at noppes.npcs.entity.EntityCustomNpc.func_70071_h_(EntityCustomNpc.java:34)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)
at net.minecraft.world.World.func_72870_g(World.java:2034)
at WorldServerOF.func_72870_g(WorldServerOF.java:347)

-- Entity being ticked --
Details:
Entity Type: customnpcs.CustomNpc (noppes.npcs.entity.EntityCustomNpc)
Entity ID: 268
Entity Name: Prisoner
Entity's Exact location: -1910.16, 69.00, -52.67
Entity's Block location: World: (-1911,69,-53), Chunk: (at 9,4,11 in -120,-4; contains blocks -1920,0,-64 to -1905,255,-49), Region: (-4,-1; contains chunks -128,-32 to -97,-1, blocks -2048,0,-512 to -1537,255,-1)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1887)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

-- Affected level --
Details:
Level name: NGM
All players: 0 total; []
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: 4769229038942337798
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-1822,70,-124), Chunk: (at 2,4,4 in -114,-8; contains blocks -1824,0,-128 to -1809,255,-113), Region: (-4,-1; contains chunks -128,-32 to -97,-1, blocks -2048,0,-512 to -1537,255,-1)
Level time: 3409813 game time, 618157 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 29771 (now: false), thunder time: 171802 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
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: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 564912600 bytes (538 MB) / 1445531648 bytes (1378 MB) up to 3207856128 bytes (3059 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -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: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1566 Optifine OptiFine_1.7.10_HD_C1 27 mods loaded, 27 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-1.7.10-10.13.4.1566-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1566} [Minecraft Forge] (forge-1.7.10-10.13.4.1566-1.7.10.jar)
UCHIJAAAA ivtoolkit{IvToolkit} [1.2] (minecraft.jar)
UCHIJAAAA MCVanillaTweaks{1.0} [Mariculture - Vanilla Tweaks] (minecraft.jar)
UCHIJAAAA psychedelicraftcore{1.4} [Psychedelicraft Core] (minecraft.jar)
UCHIJAAAA adventurebackpack{1.7.10-0.8b} [Adventure Backpack] (adventurebackpack-1.7.10-0.8c.jar)
UCHIJAAAA nevermine{2.3} [AdventOfAscension] (AoA-2.4.B.jar)
UCHIJAAAA Aquaculture{1.2.3} [Aquaculture] (Aquaculture-1.7.10-1.2.5.15.jar)
UCHIJAAAA BiblioCraft{1.11.4} [BiblioCraft] (BiblioCraft[v1.11.4][MC1.7.10].jar)
UCHIJAAAA craftguide{1.6.8.2} [CraftGuide] (CraftGuide-1.6.8.2-forge.jar)
UCHIJAAAA customnpcs{1.7.10d} [CustomNpcs] (CustomNPCs_1.7.10d.jar)
UCHIJAAAA PTRModelLib{1.0.0} [PTRModelLib] (Decocraft-2.2.1_1.7.10.jar)
UCHIJAAAA props{2.2.1} [Decocraft] (Decocraft-2.2.1_1.7.10.jar)
UCHIJAAAA MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip)
UCHIJAAAA Enchiridion{1.1} [Enchiridion] (Enchiridion-1.7.X-1.2b.jar)
UCHIJAAAA flansmod{4.10.0} [Flan's Mod] (Flans Mod-1.7.10-4.10.0.jar)
UCHIJAAAA journeymap{5.1.3b1} [JourneyMap] (journeymap-1.7.10-5.1.3b1-unlimited.jar)
UCHIJAAAA Mariculture{1.7.10-1.2.4.2a} [Mariculture] (Mariculture-Deluxe-1.7.10-1.2.4.2a.jar)
UCHIJAAAA MariTech{1.0} [Marine Technlogy] (Mariculture-Deluxe-1.7.10-1.2.4.2a.jar)
UCHIJAAAA RadixCore{2.1.1} [RadixCore] (RadixCore-1.7.10-2.1.1-universal.jar)
UCHIJAAAA MCA{1.7.10-5.1.1.0} [Minecraft Comes Alive] (MCA-1.7.10-5.1.1.0-universal.jar)
UCHIJAAAA cfm{3.4.8} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.8(1.7.10).jar)
UCHIJAAAA OreSpawn{1.7.10.20.3} [OreSpawn] (orespawn-1.7.10-20.3 (1).zip)
UCHIJAAAA harvestcraft{1.7.10j} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10La.jar)
UCHIJAAAA psychedelicraft{1.5.2} [Psychedelicraft] (Psychedelicraft-1.5.2.jar)
UCHIJAAAA TwilightForest{2.3.7} [The Twilight Forest] (twilightforest-1.7.10-2.3.7.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'

(spoiler)

okay thanks i will fix the problem from there.