2012-04-12 10:06:39 [SEVERE] Could not pass event PlayerInteractEvent to ChestShop
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:303)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
	at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:175)
	at net.minecraft.server.ItemInWorldManager.interact(ItemInWorldManager.java:287)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:636)
	at net.minecraft.server.Packet15Place.handle(SourceFile:39)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: java.lang.NullPointerException
	at com.Acrobot.ChestShop.Economy.Register.add(Register.java:15)
	at com.Acrobot.ChestShop.Economy.Economy.addServer(Economy.java:33)
	at com.Acrobot.ChestShop.Shop.Shop.sell(Shop.java:169)
	at com.Acrobot.ChestShop.Shop.ShopManagement.sell(ShopManagement.java:35)
	at com.Acrobot.ChestShop.Listeners.playerInteract.onPlayerInteract(playerInteract.java:81)
	at sun.reflect.GeneratedMethodAccessor237.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
	... 12 more