Problems with MWPSK "set as default" page


Hi, I'm using the "My Web Pages Starter Kit" (1.2.1)... the page I have "set as default" - Default.aspx - has stopped displaying if not explicitly entered in the URL for my client's website... instead, this error displays: Could not find file '...\wwwroot\App_Data\Pages.config'.Any suggestions as to why this has started happening, especially when no coding changes have been made? What is the fix for this please?Thanks!V.--------------------------------------------------------------------------------Source Error: Line 52: //if nothing was found in the cache, the data must be loaded from the diskLine 53: //load and deserialize the data from the filesystemLine 54: using (FileStream reader = File.Open(_path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))Line 55: {Line 56: XmlSerializer serializer = new XmlSerializer(typeof(T));--------------------------------------------------------------------------------