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Whenever I enter my world I get this error report. Does anyone know why, or how to fix it?

--- BEGIN ERROR REPORT 748840a --------
Generated 10/10/12 2:01 PM

Minecraft: Minecraft 1.2.5
OS: Windows 7 (x86) version 6.1
Java: 1.7.0_07, Oracle Corporation
VM: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 6310 Graphics version 4.1.10834 Compatibility Profile Context, ATI Technologies Inc.

java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.Integer
at Reflector.callInt(Reflector.java:199)
at acq.c(EntityLiving.java:972)
at acq.a(EntityLiving.java:835)
at yy.a(SourceFile:42)
at aer.a(SourceFile:86)
at nn.b(Entity.java:842)
at acq.a_(EntityLiving.java:1271)
at acq.e(EntityLiving.java:1489)
at yy.e(SourceFile:26)
at xr.e(SourceFile:73)
at acq.J_(EntityLiving.java:687)
at yy.J_(SourceFile:30)
at xd.a(World.java:2194)
at xd.f(World.java:2165)
at xd.n(World.java:2047)
at net.minecraft.client.Minecraft.k(Minecraft.java:1867)
at net.minecraft.client.Minecraft.x(Minecraft.java:822)
at net.minecraft.client.Minecraft.run(Minecraft.java:750)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT f0d88320 ----------

Quote from Rufus

Any mods installed?

Oh sorry, I guess I should have given the full report. But yes I have Forge, Optifine, TMI, and then RedPower. Here's the full report.

6 mods loaded
Optifine OptiFine_1.2.5_HD_C6
Minecraft Forge 3.3.7.135
FML v2.2.48.135
Forge Mod Loader version 2.2.48.135 for Minecraft 1.2.5
mod_TooManyItems : Available (TooManyItems2012_04_13_1.2.5.zip)
mod_MinecraftForge : Available (minecraftforge-client-3.3.7.135.zip)
mod_RedPowerCore : Available (RedPowerCore-2.0pr5b2.zip)
mod_RedPowerLighting : Available (RedPowerLighting-2.0pr5b2.zip)
mod_RedPowerLogic : Available (RedPowerLogic-2.0pr5b2.zip)
mod_RedPowerWiring : Available (RedPowerWiring-2.0pr5b2.zip)


Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem.




--- BEGIN ERROR REPORT 748840a --------
Generated 10/10/12 2:09 PM

Minecraft: Minecraft 1.2.5
OS: Windows 7 (x86) version 6.1
Java: 1.7.0_07, Oracle Corporation
VM: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 6310 Graphics version 4.1.10834 Compatibility Profile Context, ATI Technologies Inc.

java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.Integer
at Reflector.callInt(Reflector.java:199)
at acq.c(EntityLiving.java:972)
at acq.a(EntityLiving.java:835)
at yy.a(SourceFile:42)
at aer.a(SourceFile:86)
at nn.b(Entity.java:842)
at acq.a_(EntityLiving.java:1271)
at acq.e(EntityLiving.java:1489)
at yy.e(SourceFile:26)
at xr.e(SourceFile:73)
at acq.J_(EntityLiving.java:687)
at yy.J_(SourceFile:30)
at xd.a(World.java:2194)
at xd.f(World.java:2165)
at xd.n(World.java:2047)
at net.minecraft.client.Minecraft.k(Minecraft.java:1867)
at net.minecraft.client.Minecraft.x(Minecraft.java:822)
at net.minecraft.client.Minecraft.run(Minecraft.java:750)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT ef5c2f28 ----------