probs

2012-07-17 10:29:58 [INFO] [AutoSaveWorld] Backing Up Worlds
2012-07-17 10:29:59 [SEVERE] java.io.IOException: The process cannot access the file because another process has locked a portion of the file
2012-07-17 10:29:59 [SEVERE] 	at java.io.FileInputStream.readBytes(Native Method)
2012-07-17 10:29:59 [SEVERE] 	at java.io.FileInputStream.read(Unknown Source)
2012-07-17 10:29:59 [SEVERE] 	at autosave.AutoBackupThread.copyDirectory(AutoBackupThread.java:152)
2012-07-17 10:29:59 [SEVERE] 	at autosave.AutoBackupThread.copyDirectory(AutoBackupThread.java:141)
2012-07-17 10:29:59 [SEVERE] 	at autosave.AutoBackupThread.copyDirectory(AutoBackupThread.java:141)
2012-07-17 10:29:59 [SEVERE] 	at autosave.AutoBackupThread.performBackup(AutoBackupThread.java:226)
2012-07-17 10:29:59 [SEVERE] 	at autosave.AutoSave.onCommand(AutoSave.java:425)
2012-07-17 10:29:59 [SEVERE] 	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
2012-07-17 10:29:59 [SEVERE] 	at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:303)
2012-07-17 10:29:59 [SEVERE] 	at com.earth2me.essentials.Essentials.onCommand(Essentials.java:288)
2012-07-17 10:29:59 [SEVERE] 	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
2012-07-17 10:29:59 [SEVERE] 	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
2012-07-17 10:29:59 [SEVERE] 	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:479)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
2012-07-17 10:29:59 [SEVERE] 	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)