Always see NullReference exception in designer with all silverlight business applications in visual studio 2010

Question

Starting with the most simple case.

If I press \"File->new project->silverlight business application\" it opens up to MainPage.xaml saying the message attached at the bo

Answer 1

If you run into this issue, a possible cause is due to you having Microsoft SilverLight version 5.0 installed on your pc versus that of 4.0 (Version: 4.0.50826.0). Remove the copy of SilverLight 5.0. Install the version located at the following link - http://go.microsoft.com/fwlink/?LinkId=146060 DO NOT INSTALL version 5.0 IF YOU HAVE SDK 3 AND 4. INSTALL MICROSOFT SILVERLIGHT 4.0