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please help me

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 1/18/16 3:30 PM
Description: Updating screen events

java.util.ConcurrentModificationException
at com.google.common.collect.HashBiMap$Itr.checkForConcurrentModification(HashBiMap.java:339)
at com.google.common.collect.HashBiMap$Itr.hasNext(HashBiMap.java:345)
at net.minecraft.client.audio.SoundManager.func_148604_f(SoundManager.java:413)
at net.minecraft.client.audio.SoundHandler.func_147687_e(SourceFile:183)
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:802)
at net.minecraft.client.gui.GuiScreen.func_73869_a(GuiScreen.java:65)
at net.minecraft.client.gui.GuiScreen.func_146282_l(GuiScreen.java:319)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:276)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1629)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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 com.google.common.collect.HashBiMap$Itr.checkForConcurrentModification(HashBiMap.java:339)
at com.google.common.collect.HashBiMap$Itr.hasNext(HashBiMap.java:345)
at net.minecraft.client.audio.SoundManager.func_148604_f(SoundManager.java:413)
at net.minecraft.client.audio.SoundHandler.func_147687_e(SourceFile:183)
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:802)
at net.minecraft.client.gui.GuiScreen.func_73869_a(GuiScreen.java:65)
at net.minecraft.client.gui.GuiScreen.func_146282_l(GuiScreen.java:319)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:276)

-- Affected screen --
Details:
Screen name: ~~ERROR~~ NullPointerException: null

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['SummerIsFun2'/259, l='MpServer', x=-203.88, y=73.62, z=290.15]]
Chunk stats: MultiplayerChunkCache: 81, 90
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-244,64,208), Chunk: (at 12,4,0 in -16,13; contains blocks -256,0,208 to -241,255,223), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 14581 game time, 14581 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 46 total; [EntityZombie['Zombie'/146444, l='MpServer', x=-190.34, y=46.00, z=317.75], EntityBabyZombie['Baby Zombie'/146455, l='MpServer', x=-189.25, y=46.00, z=318.81], EntityPig['Pig'/99, l='MpServer', x=-277.22, y=75.19, z=323.50], EntityPig['Pig'/100, l='MpServer', x=-278.81, y=75.19, z=323.50], EntityPig['Pig'/101, l='MpServer', x=-274.50, y=75.19, z=322.50], EntityPig['Pig'/102, l='MpServer', x=-274.50, y=74.19, z=320.50], EntityPig['Pig'/135, l='MpServer', x=-239.53, y=63.00, z=308.06], EntityPig['Pig'/136, l='MpServer', x=-208.63, y=69.00, z=317.94], EntityPig['Pig'/137, l='MpServer', x=-215.81, y=69.00, z=316.50], EntityPig['Pig'/138, l='MpServer', x=-222.84, y=77.00, z=322.09], EntitySheep['Sheep'/169, l='MpServer', x=-155.50, y=74.00, z=258.50], EntitySheep['Sheep'/170, l='MpServer', x=-155.50, y=74.00, z=258.50], EntitySheep['Sheep'/171, l='MpServer', x=-155.50, y=74.00, z=258.50], EntitySheep['Sheep'/172, l='MpServer', x=-159.50, y=74.00, z=256.50], EntitySheep['Sheep'/179, l='MpServer', x=-166.50, y=64.19, z=215.50], EntityWolf['Wolf'/185, l='MpServer', x=-136.50, y=67.00, z=293.50], EntityZombie['Zombie'/156347, l='MpServer', x=-248.50, y=31.00, z=352.50], EntityWolf['Wolf'/186, l='MpServer', x=-136.50, y=66.00, z=291.50], EntityWolf['Wolf'/187, l='MpServer', x=-138.50, y=69.00, z=291.50], EntityWolf['Wolf'/188, l='MpServer', x=-140.50, y=71.00, z=292.50], EntityPig['Pig'/114381, l='MpServer', x=-195.63, y=77.00, z=349.19], EntitySheep['Sheep'/216, l='MpServer', x=-174.50, y=66.00, z=295.56], EntitySheep['Sheep'/217, l='MpServer', x=-163.78, y=74.00, z=287.19], EntitySheep['Sheep'/218, l='MpServer', x=-158.72, y=72.00, z=292.81], EntitySheep['Sheep'/219, l='MpServer', x=-170.81, y=66.00, z=282.44], EntityCow['Cow'/220, l='MpServer', x=-182.50, y=74.00, z=323.50], EntityCow['Cow'/221, l='MpServer', x=-182.50, y=65.00, z=322.50], EntityCow['Cow'/222, l='MpServer', x=-181.53, y=64.00, z=320.47], EntityCow['Cow'/223, l='MpServer', x=-180.47, y=64.00, z=321.53], EntityClientPlayerMP['SummerIsFun2'/259, l='MpServer', x=-203.88, y=73.62, z=290.15], EntityPig['Pig'/146223, l='MpServer', x=-144.50, y=70.00, z=365.50], EntityPig['Pig'/146226, l='MpServer', x=-214.94, y=80.00, z=355.88], EntityPig['Pig'/146227, l='MpServer', x=-218.47, y=81.00, z=354.31], EntityCow['Cow'/146230, l='MpServer', x=-162.50, y=69.00, z=354.50], EntityCow['Cow'/146231, l='MpServer', x=-164.50, y=68.00, z=355.50], EntityCow['Cow'/146228, l='MpServer', x=-169.38, y=63.00, z=357.03], EntityPig['Pig'/146234, l='MpServer', x=-205.72, y=78.00, z=360.97], EntityCow['Cow'/146232, l='MpServer', x=-164.50, y=73.00, z=358.50], EntityPig['Pig'/146310, l='MpServer', x=-137.50, y=71.00, z=362.50], EntityPig['Pig'/146311, l='MpServer', x=-141.50, y=70.00, z=364.50], EntityPig['Pig'/146309, l='MpServer', x=-139.50, y=71.00, z=360.50], EntitySquid['Squid'/132002, l='MpServer', x=-175.50, y=58.38, z=279.50], EntitySquid['Squid'/132001, l='MpServer', x=-177.13, y=59.31, z=276.06], EntityBat['Bat'/66987, l='MpServer', x=-132.47, y=40.00, z=284.06], EntityBabySkeleton['Baby Skeleton'/144827, l='MpServer', x=-256.50, y=83.00, z=336.50], EntityBat['Bat'/146370, l='MpServer', x=-260.03, y=10.00, z=365.31]]
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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 (x86) version 6.3
Java Version: 1.8.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 222490856 bytes (212 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -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: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.85.1230 Minecraft Forge 10.13.2.1230 Optifine OptiFine_1.7.10_HD_U_C1 24 mods loaded, 24 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
TooManyItems{1.7.10} [TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
<DragonAPI ASM>{0} [DragonAPI ASM Data Initialization] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
furnace3d{1.2.0} [Furnace 3D] ([1.7.10] 3D Furnace-1.3a.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mopickaxes{611} [Mo' Pickaxes] ([1.7.10] CST7 Mo' Pickaxes 612.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{3.2.3} [Damage Indicators] ([1.7.10]DamageIndicatorsMod-3.2.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AetherCraft{1.5.0.82} [AetherCraft] (AetherCraft-1.7.10-1.5.0.82.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
babymobs{1.0} [Baby Mobs] (BabyMobs-1.7.10-1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1057-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ComputerCraft{1.64} [ComputerCraft] (ComputerCraft-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DragonAPI{1.0} [DragonAPI] (DragonAPI 1.7.10 V10d.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CaveControl{1.0} [CaveControl] (CaveControl 1.7.10 V10b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoroAI{v1.0} [CoroAI] (CoroUtil-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtendedRenderer{v1.0} [Extended Renderer] (CoroUtil-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ConfigMod{v1.0} [Extended Mod Config] (CoroUtil-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ctrades{1.3.2} [Custom Trades Mod] (Custom-Trades-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
wuppy29_improvedmobspawn{1.5.2} [Improved Mob Spawn] (Improved Mob Spawn 1.7.10-1.5.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IronChest{6.0.41.729} [Iron Chest] (Iron-Chests-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
rideAbleSpidersMod{1.3} [Rideable SpidersMod] (Rideablespiders-1.3-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Roguelike{1.3.4} [Roguelike Dungeons] (Roguelike-Dungeons-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TerrainControl{2.6.3} [Terrain Control] (terraincontrol-forge-2.6.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
weather2{v2.3.4} [weather2] (Weather-2.3.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.7.10-Forge10.13.2.1230
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.4276, Intel
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: [NostalgiaCraft1.7_Normal.zip]
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)

this happened when i opened inventory