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I have tried installing bwg4 every way i can and now when i try to create a world it doesnt make it to the options menu and crashes. here's the report:



Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Updating screen events

A full error report has been saved to C:\Users\Stephen\AppData\Roaming\.minecraft\crash-reports\crash-2013-06-22_22.05.00-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT eec4a51d --------
Full report at:
C:\Users\Stephen\AppData\Roaming\.minecraft\crash-reports\crash-2013-06-22_22.05.00-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 6/22/13 10:05 PM

-- Head --
Stacktrace:
at net.minecraft.client.gui.GuiCreateWorld.func_73866_w_(GuiCreateWorld.java:150)
at net.minecraft.client.gui.GuiScreen.func_73872_a(SourceFile:98)
at net.minecraft.client.Minecraft.func_71373_a(Minecraft.java:642)
at net.minecraft.client.gui.GuiSelectWorld.func_73875_a(SourceFile:133)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:72)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:127)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:111)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiCreateWorld
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1499)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 364549288 bytes (347 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.44 FML v5.1.43.679 Minecraft Forge 7.7.2.679 Optifine OptiFine_1.5.1_HD_U_C4 10 mods loaded, 10 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{5.1.43.679} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{7.7.2.679} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_TooManyItems{1.5.1 2012-03-23} [mod_TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BWG4{1.0.6b} [BetterWorldGeneration4] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BetterFurnaces{3.0} [Better Furnaces] ([1.5.1]BetterFurnacesV3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ReiMinimap{v3.3_04 [1.5.1]} [mod_ReiMinimap] ([1.5.1]ReiMinimap_v3.3_04.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Backpack{1.7.8} [Backpack] (backpack-1.7.8-1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CraftableSpawners{1.5} [CraftableSpawners] (CraftableSpawners G2-1.5.1.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ReiMonkey{ReiMonkey by minecraftmonkey; Updated to MC 1.4.6 by IX iTzRogue XI} [mod_ReiMonkey] (mod_ReiMonkey.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.4.2
OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: SimpleCraft_V12.1.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.NoSuchFieldError: k
at net.minecraft.client.gui.GuiCreateWorld.func_73866_w_(GuiCreateWorld.java:150)
at net.minecraft.client.gui.GuiScreen.func_73872_a(SourceFile:98)
at net.minecraft.client.Minecraft.func_71373_a(Minecraft.java:642)
at net.minecraft.client.gui.GuiSelectWorld.func_73875_a(SourceFile:133)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:72)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:127)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:111)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1499)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 90075f9a ----------

What should I do?here's the full report:


--- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 6/22/13 10:05 PM
Description: Updating screen events

java.lang.NoSuchFieldError: k
at net.minecraft.client.gui.GuiCreateWorld.func_73866_w_(GuiCreateWorld.java:150)
at net.minecraft.client.gui.GuiScreen.func_73872_a(SourceFile:98)
at net.minecraft.client.Minecraft.func_71373_a(Minecraft.java:642)
at net.minecraft.client.gui.GuiSelectWorld.func_73875_a(SourceFile:133)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:72)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:127)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:111)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1499)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
at net.minecraft.client.gui.GuiCreateWorld.func_73866_w_(GuiCreateWorld.java:150)
at net.minecraft.client.gui.GuiScreen.func_73872_a(SourceFile:98)
at net.minecraft.client.Minecraft.func_71373_a(Minecraft.java:642)
at net.minecraft.client.gui.GuiSelectWorld.func_73875_a(SourceFile:133)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:72)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:127)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:111)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiCreateWorld
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1499)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 364549288 bytes (347 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.44 FML v5.1.43.679 Minecraft Forge 7.7.2.679 Optifine OptiFine_1.5.1_HD_U_C4 10 mods loaded, 10 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{5.1.43.679} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{7.7.2.679} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_TooManyItems{1.5.1 2012-03-23} [mod_TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BWG4{1.0.6b} [BetterWorldGeneration4] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BetterFurnaces{3.0} [Better Furnaces] ([1.5.1]BetterFurnacesV3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ReiMinimap{v3.3_04 [1.5.1]} [mod_ReiMinimap] ([1.5.1]ReiMinimap_v3.3_04.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Backpack{1.7.8} [Backpack] (backpack-1.7.8-1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CraftableSpawners{1.5} [CraftableSpawners] (CraftableSpawners G2-1.5.1.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ReiMonkey{ReiMonkey by minecraftmonkey; Updated to MC 1.4.6 by IX iTzRogue XI} [mod_ReiMonkey] (mod_ReiMonkey.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.4.2
OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: SimpleCraft_V12.1.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

I should be more specific by saying "Better World Generation 4 not working"

Any suggestions?