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i've been trying all day to get forge to work and i keep getting this

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 12/19/12 12:05 AM
Description: Ticking entity

java.lang.IllegalAccessError: tried to access field ut.c from class net.minecraftforge.common.ForgeHooks
at net.minecraftforge.common.ForgeHooks.initTools(ForgeHooks.java:176)
at net.minecraftforge.common.ForgeHooks.<clinit>(ForgeHooks.java:247)
at md.j_(EntityLiving.java:777)
at xv.a(World.java:2297)
at in.a(WorldServer.java:646)
at xv.g(World.java:2260)
at xv.h(World.java:2106)
at in.h(WorldServer.java:515)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:678)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:597)
at bdo.q(IntegratedServer.java:123)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:496)
at fy.run(SourceFile:856)


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

-- Head --
Stacktrace:
at net.minecraftforge.common.ForgeHooks.initTools(ForgeHooks.java:176)
at net.minecraftforge.common.ForgeHooks.<clinit>(ForgeHooks.java:247)
at md.j_(EntityLiving.java:777)
at xv.a(World.java:2297)
at in.a(WorldServer.java:646)
at xv.g(World.java:2260)

-- Entity being ticked --
Details:
Entity Type: Chicken (oy)
Entity ID: 46
Name: Chicken
Exact location: 325.50, 79.00, -417.50
Block location: World: (325,79,-418), Chunk: (at 5,4,14 in 20,-27; contains blocks 320,0,-432 to 335,255,-417), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Momentum: 0.00, -0.08, 0.00
Stacktrace:
at xv.h(World.java:2106)
at in.h(WorldServer.java:515)