CRAFTBOOK-2407 - Reported by FuRiouSOne

When i teleport to my city i get this every time int he console. What do i need to do to remove this error? Disable what in the config? This is a fresh craftbook install and only using old falsebook [lift up] signs. I have NO ICs and dont plan on using them.

Using CraftBook 1749 build
Spigot 465

2013-01-30 03:44:16 [INFO] FuRiouSOne issued server command: /home city
2013-01-30 03:44:17 [SEVERE] java.lang.AssertionError: 25
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.getSkullType(CraftSkull.java:43)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.(CraftSkull.java:26)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftBlock.getState(CraftBlock.java:259)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.CraftChunk.getTileEntities(CraftChunk.java:117)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.MechanicManager.enumerate(MechanicManager.java:541)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.bukkit.MechanicListenerAdapter$MechanicWorldListener$1.run(MechanicListenerAdapter.java:367)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftTask.run(CraftTask.java:53)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:517)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:481)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:416)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
2013-01-30 03:44:17 [SEVERE] A corruption issue has been found at chunk (-21, 5) Self-Triggering mechanics may not work as expected until this is resolved!
2013-01-30 03:44:17 [SEVERE] Chunk (-21, 5) starts at Location{world=CraftWorld{name=world},x=-336.0,y=0.0,z=80.0,pitch=0.0,yaw=0.0} and ends at Location{world=CraftWorld{name=world},x=-321.0,y=255.0,z=95.0,pitch=0.0,yaw=0.0}.
2013-01-30 03:44:17 [SEVERE] java.lang.AssertionError: 25
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.getSkullType(CraftSkull.java:43)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.(CraftSkull.java:26)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftBlock.getState(CraftBlock.java:259)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.CraftChunk.getTileEntities(CraftChunk.java:117)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.MechanicManager.enumerate(MechanicManager.java:541)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.bukkit.MechanicListenerAdapter$MechanicWorldListener$1.run(MechanicListenerAdapter.java:367)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftTask.run(CraftTask.java:53)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:517)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:481)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:416)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
2013-01-30 03:44:17 [SEVERE] A corruption issue has been found at chunk (-21, 5) Self-Triggering mechanics may not work as expected until this is resolved!
2013-01-30 03:44:17 [SEVERE] Chunk (-21, 5) starts at Location{world=CraftWorld{name=world},x=-336.0,y=0.0,z=80.0,pitch=0.0,yaw=0.0} and ends at Location{world=CraftWorld{name=world},x=-321.0,y=255.0,z=95.0,pitch=0.0,yaw=0.0}.
2013-01-30 03:44:17 [SEVERE] java.lang.AssertionError: 5
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.getSkullType(CraftSkull.java:43)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.(CraftSkull.java:26)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftBlock.getState(CraftBlock.java:259)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.CraftChunk.getTileEntities(CraftChunk.java:117)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.MechanicManager.enumerate(MechanicManager.java:541)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.bukkit.MechanicListenerAdapter$MechanicWorldListener$1.run(MechanicListenerAdapter.java:367)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftTask.run(CraftTask.java:53)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:517)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:481)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:416)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
2013-01-30 03:44:17 [SEVERE] A corruption issue has been found at chunk (-32, 0) Self-Triggering mechanics may not work as expected until this is resolved!
2013-01-30 03:44:17 [SEVERE] Chunk (-32, 0) starts at Location{world=CraftWorld{name=world},x=-512.0,y=0.0,z=0.0,pitch=0.0,yaw=0.0} and ends at Location{world=CraftWorld{name=world},x=-497.0,y=255.0,z=15.0,pitch=0.0,yaw=0.0}.
2013-01-30 03:44:17 [SEVERE] java.lang.AssertionError: 5
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.getSkullType(CraftSkull.java:43)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftSkull.(CraftSkull.java:26)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.block.CraftBlock.getState(CraftBlock.java:259)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.CraftChunk.getTileEntities(CraftChunk.java:117)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.MechanicManager.enumerate(MechanicManager.java:541)
2013-01-30 03:44:17 [SEVERE] at com.sk89q.craftbook.bukkit.MechanicListenerAdapter$MechanicWorldListener$1.run(MechanicListenerAdapter.java:367)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftTask.run(CraftTask.java:53)
2013-01-30 03:44:17 [SEVERE] at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:517)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:481)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:416)
2013-01-30 03:44:17 [SEVERE] at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
2013-01-30 03:44:17 [SEVERE] A corruption issue has been found at chunk (-32, 0) Self-Triggering mechanics may not work as expected until this is resolved!
2013-01-30 03:44:17 [SEVERE] Chunk (-32, 0) starts at Location{world=CraftWorld{name=world},x=-512.0,y=0.0,z=0.0,pitch=0.0,yaw=0.0} and ends at Location{world=CraftWorld{name=world},x=-497.0,y=255.0,z=15.0,pitch=0.0,yaw=0.0}.

Comment by me4502

That has nothing to do with CraftBook, you have a corrupt skull. CraftBook is even nicely telling you which chunk to find it in.

Comment by FuRiouSOne

I found the skulls (thanks to craftbook), removed and replaced them and no no erros. Any idea what makes them corrupt?