Commands such as lc_exportpart cannot be used in superflat world, which creates some inconvenience.

Full log here: https://gist.github.com/wormzjl/ec2664e4f4b1ab294adedb00d7d32157

Error with /lc_debug

[10:25:12] [Server thread/WARN] [minecraft/CommandHandler]: Couldn't process command: lc_debug java.lang.NullPointerException: null at mcjty.lostcities.dimensions.world.lost.BuildingInfo.getBuildingInfo(BuildingInfo.java:633) ~[BuildingInfo.class:?] at mcjty.lostcities.commands.CommandDebug.execute(CommandDebug.java:44) ~[CommandDebug.class:?] at com.feed_the_beast.ftbutilities.ranks.CommandOverride.execute(CommandOverride.java:88) ~[CommandOverride.class:?] at net.minecraft.command.CommandHandler.tryExecute(CommandHandler.java:119) [bj.class:?] at net.minecraft.command.CommandHandler.executeCommand(CommandHandler.java:91) [bj.class:?] at net.minecraft.network.NetHandlerPlayServer.handleSlashCommand(NetHandlerPlayServer.java:960) [pa.class:?] at net.minecraft.network.NetHandlerPlayServer.processChatMessage(NetHandlerPlayServer.java:939) [pa.class:?] at net.minecraft.network.play.client.CPacketChatMessage.processPacket(SourceFile:37) [la.class:?] at net.minecraft.network.play.client.CPacketChatMessage.processPacket(SourceFile:9) [la.class:?] at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_191] at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_191] at net.minecraft.util.Util.runTask(SourceFile:529) [h.class:?] at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:723) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668) [MinecraftServer.class:?] at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:185) [chd.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]

Error with /lc_buildpart
[10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: java.lang.ArrayIndexOutOfBoundsException: 0 [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at mcjty.lostcities.commands.CommandBuildPart.func_184881_a(CommandBuildPart.java:43) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.command.CommandHandler.func_175786_a(CommandHandler.java:119) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:91) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:960) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:939) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at java.util.concurrent.FutureTask.run(Unknown Source) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.util.Util.func_181617_a(SourceFile:529) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [10:59:03] [Server thread/INFO] [STDERR]: [mcjty.lostcities.commands.CommandBuildPart:func_184881_a:72]: at java.lang.Thread.run(Unknown Source)