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this si the 4th time my worlds have crashed with the same error please help!

---- Minecraft Crash Report ----
// I feel sad now
Time: 11/18/13 2:35 PM
Description: Exception in server tick loop
java.lang.NullPointerException
at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:47)
at net.minecraft.world.gen.structure.MapGenStructure.func_75051_a(MapGenStructure.java:81)
at biomesoplenty.world.ChunkProviderBOP.func_73153_a(ChunkProviderBOP.java:581)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:258)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1253)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:153)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:43)
at net.minecraft.server.management.PlayerManager.func_72690_a(SourceFile:208)
at net.minecraft.server.management.PlayerManager.func_72683_a(SourceFile:240)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:220)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:268)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:136)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_40, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 497592192 bytes (474 MB) / 866648064 bytes (826 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:PermSize=2048m -XX:MaxPermSize=4096m
AABB Pool Size: 3742 (209552 bytes; 0 MB) allocated, 3742 (209552 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 4, tallocated: 58
FML: MCP v8.11 FML v6.4.41.946 Minecraft Forge 9.11.1.946 79 mods loaded, 79 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.41.946} [Forge Mod Loader] (minecraftforge-9.11.1.946.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.1.946} [Minecraft Forge] (minecraftforge-9.11.1.946.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AppliedEnergistics-Core{rv13.b} [AppliedEnergistics Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.9.0.6} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.6.1.5} [Not Enough Items] (NotEnoughItems 1.6.1.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
PowerCrystalsCore{1.1.8} [PowerCrystals Core] (PowerCrystalsCore-1.1.8-7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct-Preloader{0.0.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{2.9.1.1} [Damage Indicators] (1.6.4 DamageIndicatorsv2.9.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AppliedEnergistics{rv13.b} [Applied Energistics] (appeng-rv13-b-mc162.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BetterDungeons{2.0} [Chocolate quest] (BetterDungeons2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CapsuleCorp{1.0} [Capsule corporation] (BetterDungeons2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.5.1} [BiblioCraft] (BiblioCraft[v1.5.1].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Natura{2.1.11} [Natura] (Natura-1.6.4-2.1.11.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiomesOPlenty{1.1.3} [Biomes O' Plenty] (BiomesOPlenty-universal-1.6.4-1.1.3.281.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{4.1.2} [BuildCraft] (buildcraft-A-1.6.2-4.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{4.1.2} [BC Builders] (buildcraft-A-1.6.2-4.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{4.1.2} [BC Energy] (buildcraft-A-1.6.2-4.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{4.1.2} [BC Factory] (buildcraft-A-1.6.2-4.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{4.1.2} [BC Transport] (buildcraft-A-1.6.2-4.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{4.1.2} [BC Silicon] (buildcraft-A-1.6.2-4.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ChickenChunks{1.3.3.3} [ChickenChunks] (ChickenChunks 1.3.3.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IC2{2.0.207-experimental} [IndustrialCraft 2] (industrialcraft-2_2.0.207-experimental.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CompactSolars{4.4.19.220} [Compact Solar Arrays] (compactsolars-universal-1.6.4-4.4.19.220.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ConfigMod{v1.0} [Extended Mod Config] (ConfigMod for MC v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoroAI{v1.0} [CoroAI] (CoroAI for MC v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
eplus{1.16.5b} [Enchanting Plus] (EnchantingPlus-1.16.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
EnderStorage{1.4.3.5} [EnderStorage] (EnderStorage 1.4.3.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
EnhancedCore{1.1.3} [EnhancedCore] (EnhancedCore_1.1.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtendedRenderer{v1.0} [Extended Renderer] (ExtendedRenderer for MC v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtraUtilities{0.3.5} [Extra Utilities] (extrautils - 0.3.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
factorization{0.8.04beta11} [Factorization] (Factorization-0.8.04beta11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
factorization.misc{0.8.04beta11} [Factorization Miscellaneous Nonsense] (Factorization-0.8.04beta11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
factorization.notify{0.8.04beta11} [Factorization Notification System] (Factorization-0.8.04beta11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
factorization.dimensionalSlice{0.8.04beta11} [Factorization Dimensional Slices] (Factorization-0.8.04beta11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GalacticraftCore{2.0.6} [Galacticraft Core] (Galacticraft-1.6.4-2.0.6.895.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GalacticraftMars{2.0.6} [Galacticraft Mars] (Galacticraft-Planets-1.6.4-2.0.6.895.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GraveStone{2.4.1} [GraveStone] (GraveStone_2.4.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IronChest{5.3.1.482} [Iron Chest] (Iron-Chests-Mod-1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MapWriter{2.0} [MapWriter] (mapwriter-2.0.11.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded{1.6.2R2.7.1} [MineFactory Reloaded] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatAppliedEnergistics{1.6.2R2.7.1} [MFR Compat: Applied Energistics] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatAtum{1.6.2R2.7.1} [MFR Compat: Atum] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatBackTools{1.6.2R2.7.1} [MFR Compat: BackTools] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatBiomesOPlenty{1.6.2R2.7.1} [MFR Compat: Biomes O' Plenty] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatChococraft{1.6.2R2.7.1} [MFR Compat: Chococraft] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatExtraBiomes{1.6.2R2.7.1} [MFR Compat: ExtraBiomes] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatForestry{1.6.2R2.7.1} [MFR Compat: Forestry] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatForestryPre{1.6.2R2.7.1} [MFR Compat: Forestry (part 2)] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatIC2{1.6.2R2.7.1} [MFR Compat: IC2] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatMagicalCrops{1.6.2R2.7.1} [MFR Compat: Magical Crops] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mystcraft{0.10.10.00} [Mystcraft] (mystcraft-uni-1.6.4-0.10.10.00.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatMystcraft{1.6.2R2.7.1} [MFR Compat: Mystcraft] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatPams{1.6.2R2.7.1} [MFR Compat: Pam's Mods] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Thaumcraft{4.0.4c} [Thaumcraft] (Thaumcraft4.0.4c.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Railcraft{8.2.0.0} [Railcraft] (Railcraft_1.6.2-8.2.0.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatRailcraft{1.6.2R2.7.1} [MFR Compat: Railcraft] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatRP2{1.6.2R2.7.1} [MFR Compat: RP2] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatSufficientBiomes{1.6.2R2.7.1} [MFR Compat: Sufficient Biomes] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatThaumcraft{1.6.2R2.7.1} [MFR Compat: Thaumcraft] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TwilightForest{1.20.1} [The Twilight Forest] (twilightforest-1.20.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatTwilightForest{1.6.2R2.7.1} [MFR Compat: TwilightForest] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatVanilla{1.6.2R2.7.1} [MFR Compat: Vanilla] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatXyCraft{1.6.2R2.7.1} [MFR Compat: XyCraft] (MineFactoryReloaded-2.7.1-36.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildMod{v1.0} [Build Mod] (ModBuild for MC v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Natura|ForgeMuliPart{0.1} [Natura Compat: FMP] (Natura-1.6.4-2.1.11.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NEIAddons{1.9.0.r40} [NEI Addons] (neiaddons-1.6.2-1.9.0.r40.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NEIAddons|AE{1.9.0.r40} [NEI Addons: Applied Energistics] (neiaddons-1.6.2-1.9.0.r40.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NEIAddons|CraftingTables{1.9.0.r40} [NEI Addons: Crafting Tables] (neiaddons-1.6.2-1.9.0.r40.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NEIAddons|ExtraBees{1.9.0.r40} [NEI Addons: Extra Bees] (neiaddons-1.6.2-1.9.0.r40.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NEIAddons|Forestry{1.9.0.r40} [NEI Addons: Forestry] (neiaddons-1.6.2-1.9.0.r40.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NEIAddons|MiscPeripherals{1.9.0.r40} [NEI Addons: Misc Peripherals] (neiaddons-1.6.2-1.9.0.r40.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
OpenBlocks{1.2.0} [OpenBlocks] (OpenBlocks-1.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SoulShards{1.0.39} [Soul Shards] (SoulShards-1.0.39-universal-srg.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Statues{2.0.2} [Statues] (statues-1.6.4-2.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct{1.6.X_1.5.1d} [Tinkers' Construct] (TConstruct_1.6.4_1.5.1d5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ThaumicTinkerer{2.0} [Thaumic Tinkerer] (ThaumicTinkerer 2.0-24.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TMechworks{DEV.82c8a8c} [Tinkers' Mechworks] (TMechworks_1.6.4_0.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct Environment: Sane and ready for action. Bugs may be reported.
Profiler Position: N/A (disabled)
Vec3 Pool Size: 593 (33208 bytes; 0 MB) allocated, 593 (33208 bytes; 0 MB) used
Player Count: 1 / 8; [GCCorePlayerMP['Bucksmiley2099'/415, l='hmmmmm', x=827.46, y=68.00, z=2048.03]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'