---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 8/1/13 10:29 AM
Description: Exception generating new chunk

java.lang.NullPointerException
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_76657_c(SourceFile:99)
at net.minecraft.world.chunk.Chunk.func_76603_b(Chunk.java:383)
at biomesoplenty.world.ChunkProviderBOP.func_73154_d(ChunkProviderBOP.java:382)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:166)
at net.minecraft.world.World.func_72964_e(World.java:527)
at net.minecraft.world.World.func_72798_a(World.java:412)
at net.minecraft.world.World.func_72799_c(World.java:436)
at net.minecraft.world.World.func_72922_b(World.java:383)
at net.minecraft.world.WorldProvider.func_76566_a(WorldProvider.java:102)
at net.minecraft.world.WorldServer.func_73052_b(WorldServer.java:828)
at net.minecraft.world.WorldServer.func_72963_a(WorldServer.java:792)
at net.minecraft.world.World.(World.java:296)
at net.minecraft.world.WorldServer.(WorldServer.java:108)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:74)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:107)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:443)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)
A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Stacktrace:
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_76657_c(SourceFile:99)
at net.minecraft.world.chunk.Chunk.func_76603_b(Chunk.java:383)
at biomesoplenty.world.ChunkProviderBOP.func_73154_d(ChunkProviderBOP.java:382)

-- Chunk to be generated --
Details:
Location: -14,-5
Position hash: -17179869198
Generator: RandomLevelSource
Stacktrace:
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:166)
at net.minecraft.world.World.func_72964_e(World.java:527)

-- Requested block coordinates --
Details:
Found chunk: true
Location: World: (-220,64,-76), Chunk: (at 4,4,4 in -14,-5; contains blocks -224,0,-80 to -209,255,-65), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Stacktrace:
at net.minecraft.world.World.func_72798_a(World.java:412)
at net.minecraft.world.World.func_72799_c(World.java:436)
at net.minecraft.world.World.func_72922_b(World.java:383)
at net.minecraft.world.WorldProvider.func_76566_a(WorldProvider.java:102)
at net.minecraft.world.WorldServer.func_73052_b(WorldServer.java:828)
at net.minecraft.world.WorldServer.func_72963_a(WorldServer.java:792)

-- Affected level --
Details:
Level name: New World
All players: 0 total; []
Chunk stats: ServerChunkCache: 0 Drop: 0
Level seed: -7530029528993038504
Level generator: ID 04 - BIOMESOP, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.world.World.(World.java:296)
at net.minecraft.world.WorldServer.(WorldServer.java:108)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:74)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:107)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:443)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)

-- System Details --
Details:
Minecraft Version: 1.6.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 343663848 bytes (327 MB) / 499908608 bytes (476 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
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: 1, tallocated: 75
FML: MCP v8.04 FML v6.2.35.803 Minecraft Forge 9.10.0.803 5 mods loaded, 5 mods active
mcp{8.04} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FML{6.2.35.803} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Forge{9.10.0.803} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
BiomesOPlenty{0.5.9.2} Biomes O' Plenty Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
UndergroundBiomes{0.4.2a} [Underground Biomes](UndergroundBiomes 1.6.x - 0.4.2a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Hey eanataw, would you mind hopping on our Discord and pinging myself and Forstride when you are around?

must be your config