computer crash now this

[Riddikulous]

[INFO] Starting minecraft server version 1.4.7
[INFO] Loading properties
[INFO] Default game type: SURVIVAL
[INFO] Generating keypair
[INFO] Starting Minecraft server on *:25565
[INFO] Preparing level "world"
[SEVERE] Encountered an unexpected exception NullPointerException
java.lang.NullPointerException
at codechicken.wirelessredstone.core.RedstoneEtherServer.setDimensionTransmitterCount(RedstoneEtherServer.java:636)
at codechicken.wirelessredstone.core.SaveManager.loadDimensionHash(SaveManager.java:650)
at codechicken.wirelessredstone.core.RedstoneEtherServer.<init>(RedstoneEtherServer.java:34)
at codechicken.wirelessredstone.core.RedstoneEther.loadServerWorld(RedstoneEther.java:120)
at codechicken.wirelessredstone.core.WRCoreEventHandler.onWorldLoad(WRCoreEventHandler.java:30)
at net.minecraftforge.event.ASMEventHandler_104_WRCoreEventHandler_onWorldLoad_Load.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:35)
at net.minecraftforge.event.EventBus.post(EventBus.java:103)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:279)
at ho.c(DedicatedServer.java:180)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:458)
at fy.run(SourceFile:849)

 

[lavarthan]

Remember to backup your saves. Not exactly the same error, but very similar.