FTB Monster server crashing??

[Lordhasta]

My FTB monster server is crashing all the time when I start it up, I can't even get in it.

This is the crash report: http://hastebin.com/fegekeyuxo.tex

 

[Tristam Izumi]

java.lang.RuntimeException: java.io.FileNotFoundException: .\world\chickenchunks\loginTimes.dat (The requested operation cannot be performed on a file with a user-mapped section open)

Add the folder your FTB packs are installed to into the exceptions for your antivirus. If you're not sure how to do this, Google "add exception to <antivirus name>".