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)
