[11:20:59] [launcher/ERROR] [FML/]: Coremod ACCorePlugin: Unable to class load the plugin cn.academy.core.ACCorePlugin
java.lang.ClassNotFoundException: cn.academy.core.ACCorePlugin
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_60]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_60]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_60]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_60]
at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_60]
at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460) [forge-1.7.10-10.13.4.1492-1.7.10.jar:?]
at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389) [forge-1.7.10-10.13.4.1492-1.7.10.jar:?]
at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221) [forge-1.7.10-10.13.4.1492-1.7.10.jar:?]
at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) [forge-1.7.10-10.13.4.1492-1.7.10.jar:?]
at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) [forge-1.7.10-10.13.4.1492-1.7.10.jar:?]
at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.7.10-10.13.4.1492-1.7.10.jar:?]
at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.4.1492-1.7.10.jar:?]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_60]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_60]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_60]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_60]

AC is not a coremod anymore. You can remove the MANIFEST.mf.

@WeAthFoLD get, I'll remove it later.