catching
java.lang.NoClassDefFoundError: net/minecraftforge/fml/common/gameevent/PlayerEvent$ItemPickupEvent
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.privateGetPublicMethods(Class.java:2902)
	at java.lang.Class.getMethods(Class.java:1615)
	at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:28)
	at borg.locutus.grieferbot.GrieferBOTAddon.registerEvents(GrieferBOTAddon.java:60)
	at borg.locutus.grieferbot.GrieferBOTAddon.onEnable(GrieferBOTAddon.java:44)
	at net.labymod.addon.AddonLoader.enableAddon(AddonLoader.java:349)
	at net.labymod.addon.AddonLoader.enableAddons(AddonLoader.java:309)
	at net.labymod.main.LabyMod.init(LabyMod.java:256)
	at ave.am(SourceFile:470)
	at ave.a(SourceFile:310)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.common.gameevent.PlayerEvent$ItemPickupEvent
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 19 more
Caused by: java.lang.NullPointerException
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
	... 21 more