10:02:48 [SEVERE] Could not pass event PlayerMoveEvent to ItemSlotMachine v1.2.2
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:39)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
        at net.minecraft.server.v1_5_R2.PlayerConnection.a(PlayerConnection.java:217)
        at net.minecraft.server.v1_5_R2.Packet10Flying.handle(SourceFile:136)
        at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:176)
        at net.minecraft.server.v1_5_R2.PlayerConnection.d(PlayerConnection.java:110)
        at net.minecraft.server.v1_5_R2.ServerConnection.b(SourceFile:35)
        at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:66)
        at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:580)
        at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:229)
        at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:469)
        at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:401)
        at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.IllegalArgumentException: Cannot measure distance between Factions and Luxcraft
        at org.bukkit.Location.distanceSquared(Location.java:381)
        at org.bukkit.Location.distance(Location.java:364)
        at com.DarkBlade12.ItemSlotMachine.Listener.SignListener.onPlayerMove(SignListener.java:148)
        at sun.reflect.GeneratedMethodAccessor66.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 15 more