Problem Problems running an ultimate server

[slrrpl2000]

I know this is an old modpack, but I wanted to play it with a friend recently. when i launched the server, i had this error

[SEVERE] Encountered an unexpected exception RuntimeException
java.lang.RuntimeException: Error while saving login times
at cpw.mods.fml.server.FMLServerHandler.haltGame(FMLServerHandler.java:102)
at cpw.mods.fml.common.FMLCommonHandler.raiseException(FMLCommonHandler.java:196)
at codechicken.chunkloader.ChunkLoaderManager.updateLoginTimes(ChunkLoaderManager.java:881)
at codechicken.chunkloader.ChunkLoaderManager.tickEnd(ChunkLoaderManager.java:849)
at codechicken.chunkloader.ChunkLoaderEventHandler.tickEnd(ChunkLoaderEventHandler.java:39)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:22)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:139)
at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:283)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:689)
at ho.r(DedicatedServer.java:269)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:599)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)
Caused by: java.io.FileNotFoundException: .\world\chickenchunks\loginTimes.dat (The requested operation cannot 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.ChunkLoaderManager.updateLoginTimes(ChunkLoaderManager.java:870)
... 10 more


can anyone help?

 

[Wagon153]

Turn off the antivirus on the server.