Unexpected Error Causing Game To Crash

i recently created a big modpack (around 125 mods) on version 1.7.10 and when I went to run it, it said: An Unexpected Error Occurred Causing The Game To Crash. I looked into the log and found this: [01:21:21] [main/ERROR]: Unable to launch
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient
    at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.multiplayer.WorldClient
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
    ... 6 more
Caused by: java.lang.RuntimeException: Method mutation failed: did not find cpw/mods/fml/common/eventhandler/EventBus.post / (Lcpw/mods/fml/common/eventhandler/Event;)Z
    at factorization.coremod.AbstractAsmMethodTransform$MutateCall.apply(AbstractAsmMethodTransform.java:141) ~[Factorization-1.7.10-0.8.108.jar:?]
    at factorization.coremod.ASMTransformer.applyTransform(ASMTransformer.java:167) ~[Factorization-1.7.10-0.8.108.jar:?]
    at factorization.coremod.ASMTransformer.applyTransform(ASMTransformer.java:142) ~[Factorization-1.7.10-0.8.108.jar:?]
    at factorization.coremod.ASMTransformer.transform(ASMTransformer.java:112) ~[Factorization-1.7.10-0.8.108.jar:?]
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
    at net.minecraft.client.main.Main.main(SourceFile:72) ~[Main.class:?]
    ... 6 more

I don't know what to do. Can someone help me?