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My world shut down unexpectedly, and won't start again.  I tried a new world and it worked fine.  The crash log says there was an "excetion in world tick".  I suspect it was from the mob spawn zone that I recently created.  Is there any chance of saving this world?

 

The spawn zone is a "dark" vertical shaft with tripwires, pistons, hoppers, and comparators creating shifting floors which drops mobs into a piston crusher, and hoppers collect the drops.  It has over a dozen floors and can be a lot of action depending on how many mobs spawn at any one time.

 

Here is the initial crash report:

 

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 2/28/14 11:27 AM
Description: Exception in world tick

java.lang.NullPointerException
    at net.minecraft.block.BlockComparator.func_94480_d(BlockComparator.java:82)
    at net.minecraft.block.BlockRedstoneLogic.func_71865_a(SourceFile:113)
    at net.minecraft.world.World.func_72878_l(World.java:3929)
    at net.minecraft.block.BlockRedstoneLogic.func_72220_e(SourceFile:171)
    at net.minecraft.block.BlockComparator.func_72220_e(BlockComparator.java:119)
    at net.minecraft.block.BlockComparator.func_94491_m(BlockComparator.java:87)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:176)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at net.minecraft.block.BlockComparator.func_96475_a_(BlockComparator.java:152)
    at net.minecraft.block.BlockComparator.func_94480_d(BlockComparator.java:82)
    at net.minecraft.block.BlockRedstoneLogic.func_71865_a(SourceFile:113)
    at net.minecraft.world.World.func_72878_l(World.java:3929)
    at net.minecraft.block.BlockRedstoneLogic.func_72220_e(SourceFile:171)
    at net.minecraft.block.BlockComparator.func_72220_e(BlockComparator.java:119)
    at net.minecraft.block.BlockComparator.func_94491_m(BlockComparator.java:87)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:176)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at net.minecraft.block.BlockComparator.func_96475_a_(BlockComparator.java:152)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:177)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at net.minecraft.block.BlockComparator.func_96475_a_(BlockComparator.java:152)
    at net.minecraft.block.BlockComparator.func_94480_d(BlockComparator.java:82)
    at net.minecraft.block.BlockRedstoneLogic.func_71865_a(SourceFile:113)
    at net.minecraft.world.World.func_72878_l(World.java:3929)
    at net.minecraft.block.BlockRedstoneLogic.func_72220_e(SourceFile:171)
    at net.minecraft.block.BlockComparator.func_72220_e(BlockComparator.java:119)
    at net.minecraft.block.BlockComparator.func_94491_m(BlockComparator.java:87)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:176)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at net.minecraft.block.BlockComparator.func_96475_a_(BlockComparator.java:152)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:177)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at net.minecraft.block.BlockComparator.func_96475_a_(BlockComparator.java:152)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:177)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at net.minecraft.block.BlockComparator.func_96475_a_(BlockComparator.java:152)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:177)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at net.minecraft.block.BlockComparator.func_96475_a_(BlockComparator.java:152)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:177)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at net.minecraft.world.World.func_72837_a(World.java:2930)
    at net.minecraft.world.chunk.Chunk.func_76597_e(Chunk.java:992)
    at net.minecraft.world.World.func_72796_p(World.java:2865)
    at codechicken.multipart.RedstoneInteractions$.getConnectionMask(IRedstonePart.scala:187)
    at codechicken.multipart.RedstoneInteractions$.otherConnectionMask(IRedstonePart.scala:156)
    at codechicken.multipart.scalatraits.TRedstoneTile$class.weakPowerLevel(TRedstoneTile.scala:59)
    at TileMultipart_cmp$$29.weakPowerLevel(Unknown Source)
    at codechicken.multipart.BlockMultipart.func_71865_a(BlockMultipart.scala:300)
    at net.minecraft.world.World.func_72878_l(World.java:3929)
    at net.minecraft.block.BlockRedstoneLogic.func_72220_e(SourceFile:171)
    at net.minecraft.block.BlockComparator.func_72220_e(BlockComparator.java:119)
    at net.minecraft.block.BlockComparator.func_94491_m(BlockComparator.java:87)
    at net.minecraft.block.BlockComparator.func_94479_f(BlockComparator.java:176)
    at net.minecraft.block.BlockRedstoneLogic.func_71863_a(SourceFile:135)
    at net.minecraft.block.BlockComparator.onNeighborTileChange(BlockComparator.java:276)
    at net.minecraft.world.World.func_96440_m(World.java:4489)
    at codechicken.multipart.TileMultipart.notifyTileChange(TileMultipart.scala:186)
    at codechicken.multipart.TileMultipart$.handleDescPacket(TileMultipart.scala:664)
    at codechicken.multipart.handler.MultipartCPH$$anonfun$handleCompressedTileDesc$1.apply$mcVI$sp(packethandlers.scala:63)
    at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:141)
    at codechicken.multipart.handler.MultipartCPH$.handleCompressedTileDesc(packethandlers.scala:62)
    at codechicken.multipart.handler.MultipartCPH$.handlePacket(packethandlers.scala:46)
    at codechicken.lib.packet.PacketCustom$ClientTinyPacketHandler.handle(PacketCustom.java:216)
    at codechicken.lib.packet.PacketCustom$CustomTinyPacketHandler.handle(PacketCustom.java:235)
    at cpw.mods.fml.common.network.NetworkRegistry.handleTinyPacket(NetworkRegistry.java:354)
    at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket131Packet(FMLNetworkHandler.java:430)
    at net.minecraft.client.multiplayer.NetClientHandler.func_72494_a(NetClientHandler.java:1514)
    at net.minecraft.network.packet.Packet131MapData.func_73279_a(SourceFile:41)
    at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
    at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
    at net.minecraft.client.multiplayer.WorldClient.func_72835_b(WorldClient.java:99)
    at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1930)
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
    at net.minecraft.client.main.Main.main(SourceFile:101)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

  • 1 month later...
Posted (edited)

Hi did you ever solve this? I'm getting the same, which I think is due to files not saving correctly when my PC stopped improperly.
If there's a solution, I'd love to try save this world.

 

EDIT: Sorry, after a little more inspection, its a similar error.

 

A full crashdump for mine can be found at http://pastebin.com/iqrYyczM

Edited by SmokeyTrellis
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