BTW 3-91 for 1.2.5 not installing correctly

[Fhixer]

Ok I'm new so I apologize if I sound a but nooby

When I installed BTW 3-91 I get this error and I don't know why its happening, its been a while since I tried modding 1.2.5, the weird thing is when I try installing Modloader 1.2.5 or 1.2.4 it will crash my game on the load of a new or old world and MCP will do the same thing Modloader does. If someone knows how to Fix this or knows what im doing wrong id really appreciate it!

Spoiler

Show

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

Minecraft has stopped running because it encountered a problem.




--- BEGIN ERROR REPORT 7cf3a456 --------
Generated 4/4/15 10:57 AM

Minecraft: Minecraft 1.2.5
OS: Windows 7 (amd64) version 6.1
Java: 1.7.0_67, Oracle Corporation
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
LWJGL: 2.9.0
OpenGL: GeForce GTX 550 Ti/PCIe/SSE2 version 4.4.0, NVIDIA Corporation

java.lang.NoClassDefFoundError: mod_FCBetterThanWolves
at xd.i(World.java:584)
at cs.a(SourceFile:20)
at aly.a(ChunkProviderGenerate.java:490)
at ko.a(ChunkProvider.java:198)
at ack.a(SourceFile:733)
at ko.c(ChunkProvider.java:109)
at ko.b(ChunkProvider.java:122)
at xd.d(World.java:663)
at xd.a(World.java:547)
at net.minecraft.client.Minecraft.e(SourceFile:1916)
at net.minecraft.client.Minecraft.a(SourceFile:1824)
at net.minecraft.client.Minecraft.a(SourceFile:1788)
at net.minecraft.client.Minecraft.a(SourceFile:1672)
at xh.a(SourceFile:163)
at vp.a(SourceFile:74)
at xh.a(SourceFile:233)
at vp.f(SourceFile:122)
at vp.i(SourceFile:110)
at net.minecraft.client.Minecraft.k(SourceFile:1381)
at net.minecraft.client.Minecraft.x(SourceFile:719)
at net.minecraft.client.Minecraft.run(SourceFile:671)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: mod_FCBetterThanWolves
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 22 more
Caused by: java.lang.NoClassDefFoundError: BaseMod
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
... 24 more
Caused by: java.lang.ClassNotFoundException: BaseMod
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 28 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
... 30 more
--- END ERROR REPORT e2eab085 ----------