Solved 08-11 01:02:09 [SEVERE] at org.bukkit.craftbukkit.CraftWorld.save(CraftWorld.java:642)

Hey guys my server gets this when I try to restart, any idea?

• Connecting to server...
• 08-11 01:02:09 [SEVERE] at org.bukkit.craftbukkit.CraftWorld.save(CraftWorld.java:642)
• 08-11 01:02:09 [SEVERE] at org.bukkit.command.defaults.SaveCommand.execute(SaveCommand.java:25)
• 08-11 01:02:09 [SEVERE] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
• 08-11 01:02:09 [SEVERE] at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:490)
• 08-11 01:02:09 [SEVERE] at org.bukkit.craftbukkit.CraftServer.dispatchServerCommand(CraftServer.java:486)
• 08-11 01:02:09 [SEVERE] at net.minecraft.server.DedicatedServer.ah(DedicatedServer.java:248)
• 08-11 01:02:09 [SEVERE] at net.minecraft.server.DedicatedServer.a(DedicatedServer.java:192)
• 08-11 01:02:09 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434)
• 08-11 01:02:09 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
• 08-11 01:02:09 [INFO] CONSOLE: Save complete.[m

thats the log

Solved it a 1.3 bug

This error came when I installed ptweaks! theres some problem...

EDIT by Moderator: merged posts, please use the edit button instead of double posting.