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Hi, my game keeps on crashing. Here's the error report.

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 6/28/13 6:58 PM
Description: Exception ticking world

java.lang.IncompatibleClassChangeError: Class net.minecraft.block.BlockStem does not implement the requested interface net.minecraftforge.common.IPlantable
at net.minecraft.block.Block.canSustainPlant(Block.java:2199)
at net.minecraft.block.BlockStem.func_72266_n(BlockStem.java:157)
at net.minecraft.block.BlockStem.func_71847_b(BlockStem.java:54)
at net.minecraft.world.WorldServer.func_72893_g(WorldServer.java:438)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:197)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:641)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:571)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)


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

-- Head --
Stacktrace:
at net.minecraft.block.Block.canSustainPlant(Block.java:2199)
at net.minecraft.block.BlockStem.func_72266_n(BlockStem.java:157)
at net.minecraft.block.BlockStem.func_71847_b(BlockStem.java:54)
at net.minecraft.world.WorldServer.func_72893_g(WorldServer.java:438)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:197)

-- Affected level --
Details:
Level name: My World
All players: 1 total; [EntityPlayerMP['M82A1'/304, l='My World', x=703.45, y=65.00, z=2343.30]]
Chunk stats: ServerChunkCache: 1066 Drop: 0
Level seed: 2156246194737030124
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (256,64,236), Chunk: (at 0,4,12 in 16,14; contains blocks 256,0,224 to 271,255,239), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1040778 game time, 1437838 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: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:641)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:571)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 209541304 bytes (199 MB) / 394887168 bytes (376 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1024m
AABB Pool Size: 4976 (278656 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: 63
FML: MCP v7.51 FML v5.2.17.713 Minecraft Forge 7.8.0.713 Optifine OptiFine_1.5.2_HD_U_D3 8 mods loaded, 8 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.2.17.713} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.8.0.713} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_TooManyItems{1.5.2 2013-04-25} [mod_TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{2.7.0.1} [Damage Indicators] (1.5.2 DamageIndicators v2.7.0.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BetterFurnaces{3.2} [Better Furnaces] ([1.5.2]BetterFurnacesV3.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{1.8.9} [Backpack] (Backpacks-Mod-1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.3.1} [BiblioCraft] (BiblioCraft[v1.3.1].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1617 (90552 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['M82A1'/304, l='Alex's World', x=703.45, y=65.00, z=2343.30]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'