Bukkit

2013-05-12 18:00:48 [WARNING] [Server] The main thread failed to respond after 10 seconds
2013-05-12 18:00:48 [WARNING] [Server] Probable Plugin cause: 'UltraLogger'
2013-05-12 18:00:48 [WARNING] [Server] What follows is the stack trace of the main thread
2013-05-12 18:00:48 [WARNING] [Server] at java.io.FileOutputStream.writeBytes(Native Method)
2013-05-12 18:00:48 [WARNING] [Server] at java.io.FileOutputStream.write(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at sun.nio.cs.StreamEncoder.writeBytes(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at sun.nio.cs.StreamEncoder.implWrite(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at sun.nio.cs.StreamEncoder.write(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at java.io.OutputStreamWriter.write(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at java.io.BufferedWriter.flushBuffer(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at java.io.BufferedWriter.write(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at java.io.Writer.write(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at org.ultralogger.logger.LogFile.log(LogFile.java:125)
2013-05-12 18:00:48 [WARNING] [Server] at org.ultralogger.logger.FileLogger.item_spawn(FileLogger.java:460)
2013-05-12 18:00:48 [WARNING] [Server] at sun.reflect.GeneratedMethodAccessor257.invoke(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at java.lang.reflect.Method.invoke(Unknown Source)
2013-05-12 18:00:48 [WARNING] [Server] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
2013-05-12 18:00:48 [WARNING] [Server] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
2013-05-12 18:00:48 [WARNING] [Server] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
2013-05-12 18:00:48 [WARNING] [Server] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
2013-05-12 18:00:48 [WARNING] [Server] at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callItemSpawnEvent(CraftEventFactory.java:263)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.World.addEntity(World.java:926)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.World.addEntity(World.java:896)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.Block.b(Block.java:387)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.Block.dropNaturally(Block.java:371)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.Block.c(Block.java:358)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.Block.a(Block.java:600)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.PlayerInteractManager.breakBlock(PlayerInteractManager.java:322)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.PlayerInteractManager.a(PlayerInteractManager.java:203)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:553)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.Packet14BlockDig.handle(SourceFile:46)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
2013-05-12 18:00:48 [WARNING] [Server] at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)

I'm using the latest build and bukkit #2771

Did you (open)save/edit your log while the server was enabled ?

No
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@Habbomod: Go

That's weird, it failed to write message but normally we do not write if the stream is closed... And the error isn't complete i do not know what exception was thrown but it's not your fault.