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here is the crash report

---- Minecraft Crash Report ----
// Don't do that.

Time: 6/17/15 5:39 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at tconstruct.client.tabs.InventoryTabKnapsack.shouldAddToList(InventoryTabKnapsack.java:23)
at tconstruct.client.tabs.TabRegistry.updateTabValues(TabRegistry.java:64)
at tconstruct.client.tabs.TabRegistry.guiPostInit(TabRegistry.java:43)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_106_TabRegistry_guiPostInit_Post.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at net.minecraft.client.gui.GuiScreen.func_146280_a(GuiScreen.java:257)
at net.minecraft.client.gui.inventory.GuiContainer.func_146280_a(GuiContainer.java)
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:808)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1895)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
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 tconstruct.client.tabs.InventoryTabKnapsack.shouldAddToList(InventoryTabKnapsack.java:23)
at tconstruct.client.tabs.TabRegistry.updateTabValues(TabRegistry.java:64)
at tconstruct.client.tabs.TabRegistry.guiPostInit(TabRegistry.java:43)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_106_TabRegistry_guiPostInit_Post.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at net.minecraft.client.gui.GuiScreen.func_146280_a(GuiScreen.java:257)
at net.minecraft.client.gui.inventory.GuiContainer.func_146280_a(GuiContainer.java)
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:808)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Ediarai'/2402, l='MpServer', x=-13.50, y=74.62, z=248.50]]
Chunk stats: MultiplayerChunkCache: 432, 432
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-12,64,256), Chunk: (at 4,4,0 in -1,16; contains blocks -16,0,256 to -1,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 862 game time, 862 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: 62 total; [EntitySkeleton['Skeleton'/3590, l='MpServer', x=-80.50, y=29.00, z=228.50], EntityZombie['Zombie'/2952, l='MpServer', x=-13.50, y=16.00, z=228.50], EntitySpider['Spider'/2953, l='MpServer', x=-8.06, y=15.00, z=227.09], EntityClientPlayerMP['Ediarai'/2402, l='MpServer', x=-13.50, y=74.62, z=248.50], EntitySkeleton['Skeleton'/3468, l='MpServer', x=-2.50, y=47.00, z=185.50], EntityCreeper['Creeper'/3213, l='MpServer', x=-0.50, y=20.00, z=199.50], EntityBat['Bat'/3090, l='MpServer', x=-52.51, y=16.23, z=295.55], EntityBat['Bat'/3091, l='MpServer', x=-55.97, y=16.78, z=294.38], EntityBat['Bat'/3092, l='MpServer', x=-46.50, y=14.32, z=297.41], EntityZombie['Zombie'/3750, l='MpServer', x=42.49, y=28.00, z=171.32], EntityCreeper['Creeper'/3116, l='MpServer', x=-70.50, y=24.00, z=266.50], EntityCreeper['Creeper'/3117, l='MpServer', x=-69.50, y=24.00, z=267.50], EntityCreeper['Creeper'/3118, l='MpServer', x=-68.50, y=24.00, z=266.50], EntitySkeleton['Skeleton'/3247, l='MpServer', x=-30.50, y=16.00, z=258.50], EntityChicken['Chicken'/51, l='MpServer', x=-93.50, y=81.00, z=255.50], EntityChicken['Chicken'/60, l='MpServer', x=-65.56, y=70.00, z=191.44], EntityChicken['Chicken'/61, l='MpServer', x=-70.16, y=67.00, z=188.84], EntityChicken['Chicken'/62, l='MpServer', x=-69.56, y=68.00, z=189.84], EntityChicken['Chicken'/63, l='MpServer', x=-66.50, y=69.00, z=188.50], EntityBat['Bat'/2752, l='MpServer', x=0.12, y=46.33, z=201.38], EntityBat['Bat'/2753, l='MpServer', x=-12.05, y=46.24, z=207.33], EntityBat['Bat'/2754, l='MpServer', x=4.63, y=44.16, z=203.68], EntityBat['Bat'/2755, l='MpServer', x=-1.24, y=44.59, z=196.24], EntityBat['Bat'/2631, l='MpServer', x=58.69, y=43.00, z=214.34], EntityBat['Bat'/2772, l='MpServer', x=13.87, y=22.48, z=190.28], EntityChicken['Chicken'/88, l='MpServer', x=-16.50, y=76.00, z=183.50], EntityChicken['Chicken'/89, l='MpServer', x=-13.50, y=69.00, z=183.50], EntitySkeleton['Skeleton'/2906, l='MpServer', x=11.50, y=50.00, z=219.50], EntityChicken['Chicken'/90, l='MpServer', x=-13.50, y=69.00, z=183.50], EntityChicken['Chicken'/91, l='MpServer', x=-0.63, y=68.00, z=185.44], EntitySpider['Spider'/2908, l='MpServer', x=-71.22, y=18.00, z=288.00], EntitySpider['Spider'/2909, l='MpServer', x=-68.28, y=17.00, z=292.75], EntityBat['Bat'/2529, l='MpServer', x=3.22, y=20.93, z=173.75], EntityCreeper['Creeper'/3044, l='MpServer', x=-24.50, y=46.00, z=217.50], EntitySkeleton['Skeleton'/3430, l='MpServer', x=-78.50, y=23.00, z=238.50], EntitySkeleton['Skeleton'/3431, l='MpServer', x=-79.50, y=23.00, z=238.50], EntityZombie['Zombie'/3176, l='MpServer', x=-93.50, y=18.00, z=253.50], EntityZombie['Zombie'/3432, l='MpServer', x=-80.50, y=23.00, z=241.50], EntityChicken['Chicken'/105, l='MpServer', x=17.50, y=63.00, z=171.50], EntityZombie['Zombie'/3433, l='MpServer', x=-78.50, y=23.00, z=236.50], EntityChicken['Chicken'/106, l='MpServer', x=7.44, y=66.00, z=169.53], EntityChicken['Chicken'/108, l='MpServer', x=12.50, y=65.00, z=171.50], EntityCreeper['Creeper'/3692, l='MpServer', x=-1.50, y=52.00, z=223.50], EntityCreeper['Creeper'/3693, l='MpServer', x=-8.50, y=52.00, z=224.50], EntityBat['Bat'/2927, l='MpServer', x=-12.43, y=16.80, z=235.38], EntitySpider['Spider'/3314, l='MpServer', x=-66.59, y=17.00, z=291.25], EntitySpider['Spider'/3190, l='MpServer', x=-39.82, y=34.00, z=196.33], EntitySkeleton['Skeleton'/3318, l='MpServer', x=-68.50, y=17.00, z=288.50], EntitySkeleton['Skeleton'/3319, l='MpServer', x=-67.41, y=17.00, z=289.50], EntitySkeleton['Skeleton'/3575, l='MpServer', x=9.50, y=18.00, z=249.50], EntityCreeper['Creeper'/2680, l='MpServer', x=-59.50, y=36.00, z=217.50], EntityChicken['Chicken'/120, l='MpServer', x=64.44, y=69.00, z=287.53], EntitySkeleton['Skeleton'/3320, l='MpServer', x=-65.30, y=17.00, z=291.50], EntitySkeleton['Skeleton'/3576, l='MpServer', x=9.50, y=18.00, z=246.50], EntityCreeper['Creeper'/2681, l='MpServer', x=-58.50, y=36.00, z=219.50], EntitySkeleton['Skeleton'/3577, l='MpServer', x=7.50, y=18.00, z=245.88], EntityZombie['Zombie'/3194, l='MpServer', x=-41.50, y=34.00, z=192.50], EntityZombie['Zombie'/3195, l='MpServer', x=-38.50, y=34.00, z=195.50], EntityChicken['Chicken'/124, l='MpServer', x=55.59, y=69.00, z=296.53], EntityChicken['Chicken'/125, l='MpServer', x=61.50, y=70.00, z=298.50], EntityChicken['Chicken'/126, l='MpServer', x=60.47, y=69.00, z=294.53], EntityChicken['Chicken'/127, l='MpServer', x=51.59, y=68.00, z=294.56]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2444)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:927)
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: 181851056 bytes (173 MB) / 452018176 bytes (431 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: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 20 mods loaded, 20 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1448-1.7.10.jar)
UCHIJA Forge{10.13.4.1448} [Minecraft Forge] (forge-1.7.10-10.13.4.1448-1.7.10.jar)
UCHIJA CodeChickenCore{1.0.3.28} [CodeChicken Core] (minecraft.jar)
UCHIJA appliedenergistics2-core{rv2-stable-1} [AppliedEnergistics2 Core] (minecraft.jar)
UCHIJA NotEnoughItems{1.0.3.60} [Not Enough Items] (Not-Enough-Items-1.7.10 - (1).jar)
UCHIJA OpenModsCore{0.7.3} [OpenModsCore] (minecraft.jar)
UCHIJA appliedenergistics2{rv2-stable-1} [Applied Energistics 2] (appliedenergistics2-rv2-stable-1.jar)
UCHIJA Backpack{2.0.1} [Backpack] (backpack-2.0.1-1.7.x.jar)
UCHIJA CarpentersBlocks{3.3.6} [Carpenter's Blocks] (Carpenter's Blocks v3.3.6 - MC 1.7.10.jar)
UCHIJA Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UCHIJA ExtraUtilities{1.2.4c} [Extra Utilities] (extrautilities-1.2.4c.jar)
UCHIJA flansmod{4.9.0} [Flan's Mod] (Flans Mod-1.7.10-4.9.0 (1).jar)
UCHIJA Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2 (1).jar)
UCHIJA cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar)
UCHIJA OpenMods{0.7.3} [OpenMods] (OpenModsLib-1.7.10-0.7.3.jar)
UCHIJA OpenBlocks{1.4.3} [OpenBlocks] (OpenBlocks-1.7.10-1.4.3.jar)
UCHIJA TConstruct{1.7.10-1.8.5.build957} [Tinkers' Construct] (TConstruct-1.7.10-1.8.5 (1).jar)
UCHIJA Thaumcraft{4.2.3.5} [Thaumcraft] (Thaumcraft-1.7.10-4.2.3.5 (1).jar)
UCHIJA TwilightForest{2.3.7} [The Twilight Forest] (twilightforest-1.7.10-2.3.7.jar)
GL info: ' Vendor: 'Intel' Version: '4.2.0 - Build 10.18.10.4061' Renderer: 'Intel(R) HD Graphics 4400'
OpenModsLib class transformers: [stencil_patches:FINISHED],[movement_callback:FINISHED],[map_gen_fix:ENABLED],[gl_capabilities_hook:FINISHED],[player_render_hook:FINISHED]
Class transformer null safety: all safe
AE2 Version: stable rv2-stable-1 for Forge 10.13.2.1291
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
Stencil buffer state: Function set: GL30, pool: internal, bits: 8
AE2 Integration: IC2:OFF, RotaryCraft:OFF, RC:OFF, BC:OFF, RF:ON, RFItem:ON, MFR:OFF, DSU:OFF, FZ:OFF, FMP:OFF, RB:OFF, CLApi:OFF, Waila:OFF, InvTweaks:OFF, NEI:ON, CraftGuide:OFF, Mekanism:OFF, ImmibisMicroblocks:OFF, BetterStorage:OFF
Launched Version: 1.7.10-Forge10.13.4.1448-1.7.10
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4400 GL version 4.2.0 - Build 10.18.10.4061, 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: []
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)

I have about 18 mods installed

I have no idea how to interpret a crash report, but one thing you might want to try if you haven't already is lower the number of chunks being rendered. My game kept crashing after it generated a new world like you describe, and I turned the rendered chunks number down and it finally worked.