Bukkit

What steps will reproduce the problem?
1.start with /itemfinder index while having 11 worlds to scan.
2.watch, as the server is crashing seconds after.
3.I think it will be a good idea, to make option for one world at a time.
http://dev.bukkit.org/paste/9507/

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[00:45:30 INFO]: Fungreenfox issued server command: /itemfinder index
[00:46:35 ERROR]: The server has stopped responding!
[00:46:35 ERROR]: Please report this to http://www.spigotmc.org/
[00:46:35 ERROR]: Be sure to include ALL relevant console errors and Minecraft crash reports
[00:46:35 ERROR]: Spigot version: git-Spigot-1326 (MC: 1.7.2)
[00:46:35 ERROR]: ------
[00:46:35 ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!):
[00:46:35 ERROR]: ------
[00:46:35 ERROR]: Current Thread: Server thread
[00:46:35 ERROR]: PID: 15 | Suspended: false | Native: false | State: RUNNABLE
[00:46:35 ERROR]: Stack:
[00:46:35 ERROR]: java.io.WinNTFileSystem.list(Native Method)
[00:46:35 ERROR]: java.io.File.list(Unknown Source)
[00:46:35 ERROR]: java.io.File.listFiles(Unknown Source)
[00:46:35 ERROR]: mamo.itemFinder.ItemFinder.getFilesToIndex(ItemFinder.java:250)
[00:46:35 ERROR]: mamo.itemFinder.ItemFinder.getFilesToIndex(ItemFinder.java:229)
[00:46:35 ERROR]: mamo.itemFinder.ItemFinder.onCommand(ItemFinder.java:71)
[00:46:35 ERROR]: org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[00:46:35 ERROR]: org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:175)
[00:46:35 ERROR]: org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:704)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerConnection.java:984)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:829)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java:28)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:65)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java:77)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:700)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:562)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:469)
[00:46:35 ERROR]: net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)
[00:46:35 ERROR]: ------
[00:46:35 ERROR]: Entire Thread Dump:
[00:46:35 ERROR]: ------
[00:46:35 ERROR]: Current Thread: Chunk I/O Executor Thread-1
[00:46:35 ERROR]: PID: 106 | Suspended: false | Native: false | State: WAITING
[00:46:35 ERROR]: Stack:
[00:46:35 ERROR]: sun.misc.Unsafe.park(Native Method)
[00:46:35 ERROR]: java.util.concurrent.locks.LockSupport.park(Unknown Source)
[00:46:35 ERROR]: java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
[00:46:35 ERROR]: java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
[00:46:35 ERROR]: java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
[00:46:35 ERROR]: java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[00:46:35 ERROR]: java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[00:46:35 ERROR]: java.lang.Thread.run(Unknown Source)
[00:46:35 ERROR]: ------
[00:46:35 ERROR]: Current Thread: pool-8-thread-1
[00:46:35 ERROR]: java.util.concurrent.ThreadPoolExecutor.getTask(Unknown Source)
[00:46:35 ERROR]: java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[00:46:35 ERROR]: java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[00:46:35 ERROR]: java.lang.Thread.run(Unknown Source)
[00:46:35 ERROR]: ------
[00:46:35 ERROR]: Current Thread: Dynmap Render Thread
[00:46:35 ERROR]: PID: 54 | Suspended: false | Native: false | State: WAITING
[00:46:35 ERROR]: Stack:
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:65)
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147)
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java:77)
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:700)
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273)
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:562)
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:469)
[00:46:36 ERROR]: net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)