Server Crash

[Connor_13_]

Title: Server Crash

Version: 3.1.2

OS: Windows 7

Java Version: 7

Description of Problem:

Server crashes after a while and gives me the error.

Error Messages:

2012-10-14 11:13:18 [sEVERE] Unexpected exception

java.lang.RuntimeException: java.io.FileNotFoundException: .\New Tekkit World\RedstoneEther\dimMap.dat (The process cannot access the file because it is being used by another process)

at cpw.mods.fml.server.FMLBukkitHandler.raiseException(FMLBukkitHandler.java:270)

at net.minecraft.server.ModLoader.throwException(ModLoader.java:765)

at codechicken.wirelessredstone.core.SaveManager.saveDimensionHash(SaveManager.java:702)

at codechicken.wirelessredstone.core.RedstoneEther.saveEther(RedstoneEther.java:160)

at codechicken.wirelessredstone.core.RedstoneEtherSaveHandler.onWorldSave(RedstoneEtherSaveHandler.java:17)

at forge.ForgeHooks.onWorldSave(ForgeHooks.java:300)

at net.minecraft.server.World.save(World.java:264)

at net.minecraft.server.World.doTick(World.java:1771)

at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:565)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Caused by: java.io.FileNotFoundException: .\New Tekkit World\RedstoneEther\dimMap.dat (The process cannot access the file because it is being used by another process)

at java.io.FileOutputStream.open(Native Method)

at java.io.FileOutputStream.<init>(Unknown Source)

at java.io.FileOutputStream.<init>(Unknown Source)

at codechicken.wirelessredstone.core.SaveManager.saveDimensionHash(SaveManager.java:678)

... 8 more

Error Log:

 Error Above