Return of Reckoning

Hi. After starting the launcher I get a window with this error: ata.myp:
System.Exception: You need to stop application currently using the following file: data.myp
    at MYPHandler.MYPHandler.WriteFileToArchive (FileInArchive archFile, MemoryStream MS)
    at MYPHandler.MYPHandler.ReplaceFile (FileInArchive archFile, FileStream newFile)
    at RoRLauncher.Client.UpdateWarData ()

Try to start the launcher as adminstrator and clear the read only flag from your game folder if set.