I used to work on ESRI's Flexviewer and currently work on Silverlight version template ESRIStandardMapApplication. I followed the procedure in http://help.arcgis.com/en/webapi/silverlight/help/index.html - Working with Templates, and loaded ESRI's ESRI Standard Map Application template as my new project. Then I received 17 errors. The 1st error is: Error 1 Unable to load the metadata for assembly 'ESRIStandardMapApplication1'. This assembly may have been downloaded from the web. See http://go.microsoft.com/fwlink/?LinkId=179545. The following error was encountered during load: Could not load file or assembly 'ESRIStandardMapApplication1' or one of its dependencies. The system cannot find the file specified c:\documents and settings\myName\my documents\visual studio 2010\Projects\ESRIStandardMapApplication1\ESRIStandardMapApplication1\MainPage.xaml