Minecraft: Error quien me lo solucione 10€

Adding Accesstransformer map: CoFH_at.cfg
A problem occurred running the Server launcher.java.lang.reflect.InvocationTarge
tException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.j
ava:43)
        at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.
java:12)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/World
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
        at java.lang.Class.getMethod0(Unknown Source)
        at java.lang.Class.getMethod(Unknown Source)
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
        ... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.World
        at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLo
ader.java:188)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 12 more
Caused by: java.lang.IllegalArgumentException
        at org.objectweb.asm.ClassVisitor.(Unknown Source)
        at org.objectweb.asm.ClassVisitor.(Unknown Source)
        at org.objectweb.asm.tree.ClassNode.(Unknown Source)
        at cofh.asm.ASMCore.writeWorld(ASMCore.java:795)
        at cofh.asm.ASMCore.transform(ASMCore.java:172)
        at cofh.asm.PCCASMTransformer.transform(PCCASMTransformer.java:41)
        at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchC
lassLoader.java:276)
        at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLo
ader.java:174)
        ... 14 more
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