BoP Server Crash

---- Minecraft Crash Report ----
// Oops.

Time: 7/21/13 5:14 AM
Description: Exception while ticking a block

java.lang.NoSuchMethodError: net.minecraft.world.IBlockAccess.func_72799_c(III)Z
	at net.minecraftforge.fluids.BlockFluidClassic.canFlowInto(BlockFluidClassic.java:284)
	at net.minecraftforge.fluids.BlockFluidClassic.getOptimalFlowDirections(BlockFluidClassic.java:194)
	at net.minecraftforge.fluids.BlockFluidClassic.func_71847_b(BlockFluidClassic.java:156)
	at net.minecraft.world.WorldServer.func_72955_a(WorldServer.java:615)
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:195)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:655)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:275)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:585)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
	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.minecraftforge.fluids.BlockFluidClassic.canFlowInto(BlockFluidClassic.java:284)
	at net.minecraftforge.fluids.BlockFluidClassic.getOptimalFlowDirections(BlockFluidClassic.java:194)
	at net.minecraftforge.fluids.BlockFluidClassic.func_71847_b(BlockFluidClassic.java:156)

-- Block being ticked --
Details:
	Block type: ID #1901 (tile.bop.springWater // biomesoplenty.fluids.BlockFluidSpringWater)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (38,7,209), Chunk: (at 6,0,1 in 2,13; contains blocks 32,0,208 to 47,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at net.minecraft.world.WorldServer.func_72955_a(WorldServer.java:615)
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:195)

-- Affected level --
Details:
	Level name: Smilesville
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: 3106070118246107043
	Level generator: ID 04 - BIOMESOP, ver 0. Features enabled: true
	Level generator options:
	Level spawn location: World: (236,64,196), Chunk: (at 12,4,4 in 14,12; contains blocks 224,0,192 to 239,255,207), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 188 game time, 188 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 60391 (now: false), thunder time: 89343 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:655)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:275)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:585)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows Server 2008 R2 (amd64) version 6.1
	Java Version: 1.7.0, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 149499968 bytes (142 MB) / 740818944 bytes (706 MB) up to 1908932608 bytes (1820 MB)
	JVM Flags: 2 total; -XX:MaxPermSize=128m -Xmx2048M
	AABB Pool Size: 2976 (166656 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: FML and Forge are installed
	IntCache: cache: 1, tcache: 1, allocated: 0, tallocated: 58
	FML: MCP v8.04 FML v6.2.35.800 Minecraft Forge 9.10.0.800 8 mods loaded, 8 mods active
	mcp{8.04} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	FML{6.2.35.800} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Forge{9.10.0.800} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	mod_bspkrsCore{v3.03(1.6.2)} [bspkrsCore] ([1.6.2]bspkrsCorev3.03.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	TreeCapitator{Forge 1.6.2.r01} [TreeCapitator] ([1.6.2]TreeCapitator.Forge.1.6.2.r01.Uni.CoreMod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Backpack{1.12.13} [Backpack] (backpack-1.12.13-1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	BiomesOPlenty{0.5.8} [Biomes O' Plenty] (Biomes-O-Plenty-0.5.8-1.6.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	IronChest{5.3.1.482} [Iron Chest] (ironchest-universal-1.6.2-5.3.1.482.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 728 (40768 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 0 / 20; []
	Is Modded: Definitely; Server brand changed to 'fml,forge'
	Type: Dedicated Server (map_server.txt)