[SEVERE] Could not pass event PlayerInteractEvent to ItemSlotMachine v1.2.5
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
	at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:186)
	at net.minecraft.server.v1_5_R3.PlayerInteractManager.interact(PlayerInteractManager.java:371)
	at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:637)
	at net.minecraft.server.v1_5_R3.Packet15Place.handle(SourceFile:58)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:218)
	at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:115)
	at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
	at org.spigotmc.MultiplexingServerConnection.b(MultiplexingServerConnection.java:72)
	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:583)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.IllegalArgumentException: Cannot measure distance between city and plots
	at org.bukkit.Location.distanceSquared(Location.java:381)
	at org.bukkit.Location.distance(Location.java:364)
	at com.DarkBlade12.ItemSlotMachine.SlotMachine.SlotMachineFinder.getBySlot(SlotMachineFinder.java:31)
	at com.DarkBlade12.ItemSlotMachine.Listener.SlotMachineListener.onPlayerInteract(SlotMachineListener.java:118)
	at sun.reflect.GeneratedMethodAccessor238.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
	... 17 more