[SEVERE] Could not pass event PlayerItemHeldEvent 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 net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:764)
	at net.minecraft.server.v1_5_R3.Packet16BlockItemSwitch.handle(SourceFile:27)
	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.IllegalStateException: Start block missed in BlockIterator
	at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:169)
	at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:231)
	at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:264)
	at org.bukkit.craftbukkit.v1_5_R3.entity.CraftLivingEntity.getLineOfSight(CraftLivingEntity.java:124)
	at org.bukkit.craftbukkit.v1_5_R3.entity.CraftLivingEntity.getTargetBlock(CraftLivingEntity.java:150)
	at com.DarkBlade12.ItemSlotMachine.Listener.SignListener.onPlayerItemHeld(SignListener.java:64)
	at sun.reflect.GeneratedMethodAccessor168.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)
	... 15 more