It's likely because of some style information in your app.xaml that is no longer valid because of changes in RC0/RTW.
I would first try just opening App.xaml in the editor and look for any errors (squiggly underlines) in the file, as the editor is actually pretty good at catching them. If that doesn't find it, then try opening in Blend, as that is usually even better at finding the styling errors. Finally, if you're still stuck, just remove the style info from App.xaml and make sure you're running OK, then add in the style info piece by piece. Hope this helps. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Muhammad Niaz Sent: Wednesday, October 29, 2008 1:46 AM To: listserver@ozSilverlight.com Subject: [OzSilverlight] SL 2 Error "AG_E_RUNTIME_MANAGED_UNKNOWN_ERROR" Hi All, I have updated my SL2 Beta 2 to final version SL2 without RC0. So now error is coming AG_E_RUNTIME_MANAGED_UNKNOWN_ERROR [Line: 173 Position: 26] This error comes in App.xaml.cs's InitializeComponent() . Can anybody help me. Thanks & Regards, Muhammad Niaz Software Engineer Intagleo Systems Pvt Ltd www.intagleo.co.uk ------------------------------------------------------------------- OzSilverlight.com - to unsubscribe from this list, send a message back to the list with 'unsubscribe' as the subject. Powered by mailenable.com - List managed by www.readify.net ------------------------------------------------------------------- OzSilverlight.com - to unsubscribe from this list, send a message back to the list with 'unsubscribe' as the subject. Powered by mailenable.com - List managed by www.readify.net