Why does my FTB unleashed server leep crashing?

I recently made a FTB Unleashed server for me and my friends but after about 20-30 minutes of playing the server will crash! I don't know how to read crash logs so could someone help?!
Here's the server crash log:

- Minecraft Crash Report ----
// I just don't know what went wrong.

Time: 12/31/13 7:57 PM
Description: Exception in server tick loop

java.lang.RuntimeException: java.io.FileNotFoundException: .\world\chickenchunks\loginTimes.dat (The requested operation can't be performed on a file with a user-mapped section open)
at codechicken.chunkloader.ChunkLoaderManag…
at codechicken.chunkloader.ChunkLoaderManag…
at codechicken.chunkloader.ChunkLoaderEvent…
at cpw.mods.fml.common.SingleIntervalHandle…
at cpw.mods.fml.common.FMLCommonHandler.tic…
at cpw.mods.fml.common.FMLCommonHandler.onP…
at net.minecraft.server.MinecraftServer.fun…
at net.minecraft.server.dedicated.Dedicated…
at net.minecraft.server.MinecraftServer.fun…
at net.minecraft.server.MinecraftServer.run…
at net.minecraft.server.ThreadMinecraftServ…
Caused by: java.io.FileNotFoundException: .\world\chickenchunks\loginTimes.dat (The requested operation can't be performed on a file with a user-mapped section open)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at codechicken.chunkloader.ChunkLoaderManag…
… 10 more

Guest

Can you post the entire Log from your console?

Also, it seems like your loginTimes.dat file is corrupted, try deleting that and see how it goes, if nothing works then redownload FTB.

Guest