Return of Reckoning

A friend of mine has an error on launcher:

"Data.myp:
System.Exception: You need to stop application currently using the following file: data.myp
σε MYPHandler.MYPHandler.WriteFileToArchive(FileInArchive archFile, MemoryStream MS)
σε MYPHandler.MYPHandler.ReplaceFile(FileInArchive archFile, FileStream newFile)
σε RoRLauncher.Client.UpdateWarData()"

After that the game manages to launch but with an error so there are not any characters or server to select.
Any help?

Well he unchecked the read only for the whole Warhammer folder and that did the trick!