玩一段时间就出现错误,求助

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Mods loaded: 62
ModLoader 1.1
mod_ModLoaderMp 1.0.0
mod_MinecraftForge 1.3.3.12
mod_TooManyItems 1.1 2012-02-17
mod_Fireworks 1.5
mod_HangableMaps 1.1
mod_IDResolver 1.1 - Update 0
mod_Boombox 2.2 for MC 1.1
mod_ReiMinimap v3.0_01汉化by大刘 [1.1]
mod_AnimalBikes AnimalBikes 1.9.0
mod_betterDungeons 0.921
mod_BuildCraftCore 2.2.12
mod_BuildCraftBuilders 2.2.12
mod_BuildCraftEnergy 2.2.12
mod_BuildCraftFactory 2.2.12
mod_BuildCraftTransport 2.2.12
mod_CraftGuide 1.4.2 for Minecraft 1.1.0
mod_EE EE2 v1.0.0
mod_HotAirBalloons v2.01 - 1.0.0
mod_IC2 v1.71
mod_PowerConverters 1.1.0R1.3.1
mod_BCIC2Crossover 1.24b for MC 1.1, BC 2.2.12, IC2 1.70
mod_Millenaire 2.1.6
mod_Minions 1.1
mod_ManaSys 1.1.0_v6.2
mod_PortalGun 1.1.0v3
mod_printerblock 1.1.0 by TeeLuk updated by pitman-87
mod_QuickGuide 1.1
mod_RailcraftAutomation 3.2.1
mod_RailcraftBuildcraft 3.2.1
mod_RailcraftCore 3.2.1
mod_RailcraftExtras 3.2.1
mod_RailcraftFactory 3.2.1
mod_RailcraftInfrastructure 3.2.1
mod_RailcraftRails 3.2.1
mod_RedPowerArray 2.0pr4d
mod_RedPowerCore 2.0pr4d
mod_RedPowerLighting 2.0pr4d
mod_RedPowerLogic 2.0pr4d
mod_RedPowerMachine 2.0pr4d
mod_RedPowerWiring 2.0pr4d
mod_RedPowerWorld 2.0pr4d
mod_InvTweaks 1.37b (1.1)
mod_Shelf 1.1
mod_SmartMovingMp 6.6
mod_HeroesGuild 1.3.0
mod_ThaumCraft 1.2.5
mod_Timber 1.1.0
mod_TooManyItems 1.1 2012-02-17
mod_TwilightForest 1.6r2
Balkon's WeaponMod 1.1.0 v8.4.0
mod_PowerConfigurator 0.6
mod_WirelessRedstone 1.5
mod_WirelessRemote 0.5
mod_WirelessSniffer 0.6
mod_WirelessTriangulator 0.5
mod_WorldEditCUI 1.1 for Minecraft version 1.1
mod_Elevator Minecraft 1.1
mod_ClayMan 1.0.0
mod_Backpack 1.1.0_v2-2
mod_MineFactory 1.1.0R1.4.1
mod_MineFactoryCompat_Grass 1.1.0R1.4.1
      Minecraft has crashed!      
      ----------------------      
Minecraft has stopped running because it encountered a problem.
If you wish to report this, please copy this entire text and email it to support@mojang.com.
Please include a description of what you did when the error occured.

--- BEGIN ERROR REPORT 19fbe657 --------
Generated 12-6-8 下午12:50
Minecraft: Minecraft 1.1
OS: Windows 7 (amd64) version 6.1
Java: 1.6.0_31, Sun Microsystems Inc.
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: GeForce GT 520/PCI/SSE2 version 4.2.0, NVIDIA Corporation
java.lang.NullPointerException
at mod_betterDungeons.getRandomMap(mod_betterDungeons.java:1306)
at mod_betterDungeons.GenerateSurface(mod_betterDungeons.java:597)
at ModLoader.PopulateChunk(ModLoader.java:1194)
at jx.a(jx.java:126)
at aal.a(Chunk.java:893)
at jx.c(jx.java:68)
at jx.b(jx.java:76)
at vq.c(World.java:465)
at vq.f(World.java:2346)
at vq.c(World.java:2202)
at net.minecraft.client.Minecraft.k(SourceFile:1598)
at net.minecraft.client.Minecraft.x(SourceFile:709)
at net.minecraft.client.Minecraft.run(SourceFile:662)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 76727ae1 ----------