theundergrounderror

Could not pass event InventoryPickupItemEvent to TheUnderground v4.3BETA
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.TileEntityHopper.a(TileEntityHopper.java:445) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.TileEntityHopper.a(TileEntityHopper.java:378) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.TileEntityHopper.m(TileEntityHopper.java:193) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.TileEntityHopper.c(TileEntityHopper.java:177) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.World.tickEntities(World.java:1488) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.WorldServer.tickEntities(WorldServer.java:597) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:786) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_31]
Caused by: java.lang.NullPointerException
	at com.minelazz.epicworldgenerator.theunderground.miningmachine.MiningMachine.j(Unknown Source) ~[?:?]
	at com.minelazz.epicworldgenerator.theunderground.miningmachine.MiningMachine.o(Unknown Source) ~[?:?]
	at com.minelazz.epicworldgenerator.theunderground.miningmachine.b.a(Unknown Source) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_31]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_31]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_31]
	at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_31]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.8.jar:git-Spigot-76236cb-62a2169]
	... 14 more