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my minecraft has been freezing after i installed forge. i can play bt it randomly freezes then stops responding but this last time it crashed this is the crash report.



---- Minecraft Crash Report ----
// Why is it breaking

Time: 5/15/13 8:54 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: Jungle Time
All players: 1 total; [EntityPlayerMP['qp_xRyanex_qp'/367, l='Jungle Time', x=164.10, y=64.50, z=145.64]]
Chunk stats: ServerChunkCache: 709 Drop: 0
Level seed: 159357867
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (152,64,252), Chunk: (at 8,4,12 in 9,15; contains blocks 144,0,240 to 159,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1932 game time, 1932 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 58238 (now: false), thunder time: 163996 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
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_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 332534504 bytes (317 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 4058 (227248 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 2, allocated: 4, tallocated: 60
FML: MCP v7.51 FML v5.2.2.684 Minecraft Forge 7.8.0.684 Optifine OptiFine_1.5.2_HD_U_D2 11 mods loaded, 11 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.2.2.684} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.8.0.684} [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
jammyfurniture{4.4} [Jammy Furniture Mod] (1.5.2_Jammy_Furniture_Mod_V4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cfm{2.8.4} [MrCrayfish's Furniture Mod] ([Forge]FurnitureMod2.8.4(FULL).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiomesOPlenty{0.5.2} [Biomes O' Plenty] (Biomes-O-Plenty-0.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.7.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks{1.54b} [Inventory Tweaks] (InventoryTweaks-1.54b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MCA{3.3.3} [Minecraft Comes Alive] (mca v3.3.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_Timber{1.5.1r2} [Timber!] (Timber! (1.5.2).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 938 (52528 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['qp_xRyanex_qp'/367, l='Jungle Time', x=164.10, y=64.50, z=145.64]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

please help