Error at the launcher

[Nazalgar]

I am trying to log in for the first time and there is this Error:

System.Expection: You need to stop application currently using the data.myp
by MYPHandler.MYPHandler.WriterFileToArchive
by MYPHandler.MYPHandler.ReplaceFile
by RoRLauncher.Client.UpdateWarData

Thanks for help

[RonJeremy]

I had same problem just do this:
Right click on your game folder
Go into properties
Uncheck ,,Read Only''

[Dockyard]

I have the same problem but when i click uncheck ready only nothing happens