CRAFTBOOK-2776 - Reported by Kro55f1r3

All works till i made 3 melody box (MC1270) connected with redstone lever.
Now when craftbook is activated , that's making this and block the launch of the server

2013-11-08 12:34:23 [SEVERE] Could not pass event SourcedBlockRedstoneEvent to CraftBook v3.7-SNAPSHOT:3311-a992624,master
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.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at com.sk89q.craftbook.bukkit.MechanicListenerAdapter.handleDirectWireInput(MechanicListenerAdapter.java:335)
at com.sk89q.craftbook.bukkit.MechanicListenerAdapter.handleRedstoneForBlock(MechanicListenerAdapter.java:271)
at com.sk89q.craftbook.bukkit.MechanicListenerAdapter.onBlockRedstoneChange(MechanicListenerAdapter.java:181)
at sun.reflect.GeneratedMethodAccessor73.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)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.a(BlockRedstoneWire.java:116)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:41)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:449)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:452)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:452)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:452)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:452)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:452)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:452)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:452)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:448)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.applyPhysics(World.java:448)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.k(BlockRedstoneWire.java:49)
at net.minecraft.server.v1_6_R3.BlockRedstoneWire.doPhysics(BlockRedstoneWire.java:238)
at net.minecraft.server.v1_6_R3.World.g(World.java:501)
at net.minecraft.server.v1_6_R3.World.c(World.java:478)
at net.minecraft.server.v1_6_R3.BlockDiodeAbstract.h_(BlockDiodeAbstract.java:191)
at net.minecraft.server.v1_6_R3.BlockRepeater.remove(SourceFile:131)
at net.minecraft.server.v1_6_R3.Chunk.a(Chunk.java:389)
at net.minecraft.server.v1_6_R3.World.setTypeIdAndData(World.java:301)
at net.minecraft.server.v1_6_R3.BlockDiodeAbstract.a(BlockDiodeAbstract.java:50)
at net.minecraft.server.v1_6_R3.WorldServer.a(WorldServer.java:532)
at net.minecraft.server.v1_6_R3.WorldServer.doTick(WorldServer.java:199)
at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:566)
at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
at com.sk89q.craftbook.mech.CommandSigns.onBlockRedstoneChange(CommandSigns.java:67)
at sun.reflect.GeneratedMethodAccessor76.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)
... 70 more

Maybe you know already this problem and can give me what i need to do to prevent this ?

Comment by Alfista

I have the same issue with the latest 3.7.11.2 version.

Comment by me4502

The error was fixed the other day in the development builds.
http://builds.enginehub.org/job/craftbook/

Comment by me4502

Please use the latest development build