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So whenever i try to open any gun box it crashes my game and here is what it says on the report

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 4/7/15 6:10 PM
Description: Rendering screen

java.lang.NullPointerException: Rendering screen
at net.minecraft.client.renderer.entity.RenderItem.func_94149_a(RenderItem.java:732)
at net.minecraft.client.renderer.entity.RenderItem.renderItemIntoGUI(RenderItem.java:498)
at net.minecraft.client.renderer.entity.RenderItem.func_77015_a(RenderItem.java:397)
at com.flansmod.client.gui.GuiGunBox.drawSlotInventory(GuiGunBox.java:175)
at com.flansmod.client.gui.GuiGunBox.func_73863_a(GuiGunBox.java:98)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1061)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:990)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at net.minecraft.client.renderer.entity.RenderItem.func_94149_a(RenderItem.java:732)
at net.minecraft.client.renderer.entity.RenderItem.renderItemIntoGUI(RenderItem.java:498)
at net.minecraft.client.renderer.entity.RenderItem.func_77015_a(RenderItem.java:397)
at com.flansmod.client.gui.GuiGunBox.drawSlotInventory(GuiGunBox.java:175)
at com.flansmod.client.gui.GuiGunBox.func_73863_a(GuiGunBox.java:98)

-- Screen render details --
Details:
Screen name: com.flansmod.client.gui.GuiGunBox
Mouse location: Scaled: (267, 139). Absolute: (800, 418)
Screen size: Scaled: (534, 279). Absolute: (1600, 837). Scale factor of 3

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Flyer17'/206, l='MpServer', x=-661.28, y=63.73, z=1035.00]]
Chunk stats: MultiplayerChunkCache: 441, 447
Level seed: 0
Level generator: ID 04 - BIOMESOP, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-741,64,965), Chunk: (at 11,4,5 in -47,60; contains blocks -752,0,960 to -737,255,975), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
Level time: 2667074 game time, 82791 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 106 total; [EntityBat['Bat'/61441, l='MpServer', x=-732.06, y=13.82, z=966.58], EntityBat['Bat'/61442, l='MpServer', x=-728.95, y=15.67, z=963.16], EntitySpider['Spider'/50691, l='MpServer', x=-43.02, y=-19.85, z=29.20], EntitySquid['Squid'/59144, l='MpServer', x=-699.59, y=55.00, z=1036.56], EntitySquid['Squid'/59145, l='MpServer', x=-702.72, y=57.06, z=1049.28], EntitySquid['Squid'/59148, l='MpServer', x=-691.50, y=53.81, z=1042.91], EntityZombie['Zombie'/60684, l='MpServer', x=-639.50, y=37.00, z=1096.50], EntitySquid['Squid'/59149, l='MpServer', x=-689.47, y=51.42, z=1031.47], EntityBlock['unknown'/26126, l='MpServer', x=-608.75, y=25.00, z=1013.25], EntityBlock['unknown'/54291, l='MpServer', x=-608.75, y=25.00, z=1013.25], EntitySkeleton['Skeleton'/61208, l='MpServer', x=-638.60, y=43.00, z=1092.65], EntitySkeleton['Skeleton'/59677, l='MpServer', x=-631.91, y=28.00, z=1024.50], EntityZombie['Zombie'/62243, l='MpServer', x=-661.14, y=36.00, z=1032.33], EntityBat['Bat'/61988, l='MpServer', x=-691.46, y=20.03, z=1028.57], EntityBat['Bat'/61989, l='MpServer', x=-692.17, y=20.00, z=1037.38], EntityBlock['unknown'/25638, l='MpServer', x=-647.75, y=62.00, z=1045.25], EntityCreeper['Creeper'/62250, l='MpServer', x=-632.50, y=36.00, z=996.50], EntityZombie['Zombie'/62255, l='MpServer', x=-635.91, y=44.00, z=1085.66], EntityZombie['Zombie'/62256, l='MpServer', x=-636.31, y=44.00, z=1087.38], EntityZombie['Zombie'/62257, l='MpServer', x=-637.94, y=43.00, z=1091.70], EntityCreeper['Creeper'/62263, l='MpServer', x=-667.50, y=14.00, z=1039.50], EntityBlock['unknown'/53816, l='MpServer', x=-647.75, y=62.00, z=1045.25], EntityHat['unknown'/62268, l='MpServer', x=-636.31, y=44.00, z=1087.38], EntitySpider['Spider'/62013, l='MpServer', x=-631.50, y=28.00, z=1036.50], EntitySkeleton['Skeleton'/62014, l='MpServer', x=-659.50, y=35.00, z=994.50], EntitySkeleton['Skeleton'/62015, l='MpServer', x=-660.13, y=35.00, z=993.44], EntityBat['Bat'/60736, l='MpServer', x=-735.25, y=24.10, z=969.25], EntitySkeleton['Skeleton'/62016, l='MpServer', x=-659.50, y=35.00, z=992.31], EntityBat['Bat'/60482, l='MpServer', x=-722.25, y=21.10, z=967.31], EntityBat['Bat'/60483, l='MpServer', x=-724.50, y=17.73, z=969.97], EntityBat['Bat'/60484, l='MpServer', x=-722.31, y=21.10, z=968.50], EntityZombie['Zombie'/36677, l='MpServer', x=-4.09, y=-49.48, z=20.93], EntityCreeper['Creeper'/60997, l='MpServer', x=-628.50, y=31.00, z=1044.50], EntityEnderman['Enderman'/61512, l='MpServer', x=-735.94, y=12.00, z=968.22], EntityBat['Bat'/61769, l='MpServer', x=-628.32, y=28.02, z=1034.76], EntityEnderman['Enderman'/61513, l='MpServer', x=-739.72, y=12.00, z=968.78], EntityBat['Bat'/61770, l='MpServer', x=-630.34, y=28.12, z=1036.23], EntityEnderman['Enderman'/61514, l='MpServer', x=-739.50, y=12.00, z=969.69], EntityHat['unknown'/62026, l='MpServer', x=-728.95, y=15.67, z=963.16], EntityBat['Bat'/61772, l='MpServer', x=-635.25, y=29.10, z=1040.75], FancyEntityItem['item.item.InfiTool'/42828, l='MpServer', x=-669.81, y=63.13, z=1048.94], EntityBat['Bat'/61776, l='MpServer', x=-727.52, y=59.52, z=1104.15], EntitySkeleton['Skeleton'/61009, l='MpServer', x=-633.50, y=39.00, z=1105.50], EntitySquid['Squid'/59219, l='MpServer', x=-694.38, y=59.25, z=998.81], EntityCreeper['Creeper'/61011, l='MpServer', x=-724.50, y=38.00, z=1106.50], EntitySquid['Squid'/59225, l='MpServer', x=-693.63, y=60.06, z=1002.34], EntityHat['unknown'/61785, l='MpServer', x=-727.52, y=59.52, z=1104.15], EntityHat['unknown'/61786, l='MpServer', x=-739.50, y=12.00, z=969.69], EntityZombie['Zombie'/62045, l='MpServer', x=-676.50, y=43.00, z=1076.50], EntitySkeleton['Skeleton'/60766, l='MpServer', x=-722.53, y=14.00, z=981.84], EntitySkeleton['Skeleton'/62048, l='MpServer', x=-657.50, y=48.00, z=1064.50], EntityClientPlayerMP['Flyer17'/206, l='MpServer', x=-661.28, y=63.73, z=1035.00], EntityZombie['Zombie'/61541, l='MpServer', x=-741.50, y=23.00, z=1031.50], EntityCreeper['Creeper'/61542, l='MpServer', x=-644.50, y=51.00, z=1107.50], EntityHat['unknown'/62054, l='MpServer', x=-704.56, y=62.39, z=966.56], EntityHat['unknown'/62056, l='MpServer', x=-676.50, y=43.00, z=1076.50], EntitySkeleton['Skeleton'/61289, l='MpServer', x=-626.50, y=29.00, z=1038.50], EntityChicken['Chicken'/105, l='MpServer', x=-704.56, y=62.39, z=966.56], EntityHat['unknown'/62057, l='MpServer', x=-657.50, y=48.00, z=1064.50], EntityZombie['Zombie'/61290, l='MpServer', x=-631.03, y=29.00, z=1038.38], EntityHat['unknown'/621, l='MpServer', x=-661.28, y=64.62, z=1035.00], EntityHat['unknown'/61550, l='MpServer', x=-741.50, y=23.00, z=1031.50], EntityCreeper['Creeper'/60796, l='MpServer', x=-735.50, y=33.00, z=1047.50], EntityBlock['unknown'/638, l='MpServer', x=-647.75, y=62.00, z=1045.25], EntityCreeper['Creeper'/61822, l='MpServer', x=-728.50, y=13.00, z=966.50], EntityBlock['unknown'/639, l='MpServer', x=-608.75, y=25.00, z=1013.25], EntityTrail['unknown'/641, l='MpServer', x=-661.28, y=64.62, z=1035.00], EntityBat['Bat'/61058, l='MpServer', x=-660.01, y=45.00, z=1001.24], EntityBat['Bat'/61059, l='MpServer', x=-655.29, y=43.23, z=1010.41], FancyEntityItem['item.item.InfiTool'/137, l='MpServer', x=-681.59, y=61.13, z=1066.84], EntityCow['Cow'/54412, l='MpServer', x=-599.94, y=64.00, z=1112.91], EntityItem['item.item.rottenFlesh'/58259, l='MpServer', x=-685.03, y=61.13, z=1076.38], EntityZombie['Zombie'/62356, l='MpServer', x=-684.50, y=28.00, z=1063.50], EntityCreeper['Creeper'/62364, l='MpServer', x=-684.43, y=19.00, z=1037.07], EntityCreeper['Creeper'/62365, l='MpServer', x=-687.50, y=20.00, z=1040.50], EntityZombie['Zombie'/58529, l='MpServer', x=-639.50, y=17.00, z=1041.50], EntitySkeleton['Skeleton'/60836, l='MpServer', x=-666.50, y=44.00, z=1001.50], EntitySkeleton['Skeleton'/61860, l='MpServer', x=-640.48, y=40.06, z=1099.30], EntityBlock['unknown'/23717, l='MpServer', x=-647.75, y=62.00, z=1045.25], EntitySkeleton['Skeleton'/61861, l='MpServer', x=-636.72, y=40.00, z=1105.09], EntitySkeleton['Skeleton'/61862, l='MpServer', x=-638.50, y=41.00, z=1097.44], EntityCreeper['Creeper'/61364, l='MpServer', x=-734.50, y=31.00, z=1110.50], EntityZombie['Zombie'/50613, l='MpServer', x=-24.87, y=-0.03, z=-7.12], EntityCreeper['Creeper'/61365, l='MpServer', x=-735.50, y=31.00, z=1109.50], EntityZombie['Zombie'/61880, l='MpServer', x=-690.50, y=21.00, z=1038.50], EntityBlock['unknown'/25017, l='MpServer', x=-647.75, y=62.00, z=1045.25], EntityZombie['Zombie'/61881, l='MpServer', x=-664.50, y=38.00, z=988.50], EntitySkeleton['Skeleton'/60858, l='MpServer', x=-738.54, y=12.00, z=969.69], EntitySquid['Squid'/59324, l='MpServer', x=-703.84, y=51.34, z=1007.63], EntitySkeleton['Skeleton'/61887, l='MpServer', x=-591.50, y=26.00, z=1084.50], EntityZombie['Zombie'/60872, l='MpServer', x=-657.50, y=36.00, z=985.50], EntitySkeleton['Skeleton'/50381, l='MpServer', x=-10.68, y=-0.05, z=54.82], EntitySkeleton['Skeleton'/61391, l='MpServer', x=-628.50, y=30.00, z=1042.50], EntityCreeper['Creeper'/62159, l='MpServer', x=-660.50, y=36.00, z=1033.50], EntitySkeleton['Skeleton'/61648, l='MpServer', x=-731.50, y=33.00, z=1106.50], EntityZombie['Zombie'/62172, l='MpServer', x=-659.47, y=35.72, z=1021.25], EntityCow['Cow'/53725, l='MpServer', x=-653.91, y=63.00, z=1089.06], EntityZombie['Zombie'/62173, l='MpServer', x=-660.13, y=36.00, z=1032.66], EntitySheep['Sheep'/53726, l='MpServer', x=-649.47, y=67.00, z=1100.81], EntityZombie['Zombie'/62174, l='MpServer', x=-661.97, y=36.00, z=1031.32], EntityZombie['Zombie'/62175, l='MpServer', x=-662.91, y=36.00, z=1031.19], EntitySkeleton['Skeleton'/60139, l='MpServer', x=-705.50, y=13.00, z=985.50], EntitySquid['Squid'/59373, l='MpServer', x=-668.66, y=55.06, z=978.31], EntitySquid['Squid'/59376, l='MpServer', x=-660.41, y=51.75, z=977.69], EntityHat['unknown'/62193, l='MpServer', x=-662.91, y=36.00, z=1031.19], EntityBat['Bat'/60154, l='MpServer', x=-729.42, y=27.05, z=1014.41]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2433)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:908)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 265955328 bytes (253 MB) / 814342144 bytes (776 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: 12, tallocated: 97
FML: MCP v9.05 FML v7.10.85.1230 Minecraft Forge 10.13.2.1230 28 mods loaded, 28 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1230} [Forge Mod Loader] (forge-1.7.10-10.13.2.1230.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1230} [Minecraft Forge] (forge-1.7.10-10.13.2.1230.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.4.35} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.0.4.83} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.4.83-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
lucky{5.1.0} [Lucky Block] ([1-7-10]_Lucky_Block_v5-1-0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AnimationAPI{1.2.4} [AnimationAPI] (AnimationAPI-1.7.10-1.2.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1062-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{6.3.6} [BuildCraft] (buildcraft-6.3.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{6.3.6} [BC Transport] (buildcraft-6.3.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{6.3.6} [BC Silicon] (buildcraft-6.3.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{6.3.6} [BC Builders] (buildcraft-6.3.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{6.3.6} [BC Energy] (buildcraft-6.3.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{6.3.6} [BC Factory] (buildcraft-6.3.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CarpentersBlocks{3.3.5} [Carpenter's Blocks] (Carpenter's Blocks v3.3.5 - MC 1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
chisel{2.3.5.31} [Chisel 2] (Chisel2-2.3.5.31.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
flansmod{4.9.0} [Flan's Mod] (Flans Mod-1.7.10-4.9.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
iChunUtil{4.1.3} [iChunUtil] (iChunUtil-4.1.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Hats{4.0.1} [Hats] (Hats-4.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks{1.59-dev-152-cf6e263} [Inventory Tweaks] (InventoryTweaks-1.59-dev-152.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SlimevoidLib{2.0.4.7} [Slimevoid Library] (SlimevoidLibrary-2.0.4.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LittleBlocks{2.2.4.4} [Little Blocks] (LittleBlocks-2.2.4.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Morph{0.9.1} [Morph] (Morph-Beta-0.9.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishs-Furniture-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MutantCreatures{1.4.8} [Mutant Creatures] (MutantCreatures-1.7.10-1.4.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct{1.7.10-1.8.2.build858} [Tinkers' Construct] (TConstruct-1.7.10-1.8.2a.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
witchery{0.22.0} [Witchery] (witchery-1.7.10-0.22.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
Launched Version: 1.7.10-Forge10.13.2.1230
LWJGL: 2.9.1
OpenGL: AMD Radeon(TM) HD 8610G GL version 4.3.12804 Compatibility Profile Context 13.352.1004.0, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)