title: Error: unable to start debugging. Silverlight developer runtime is not installed. Please install matching version
body: <p>I have VS2010 and Silverlight SDK 3 and 4. I have created a sample application in vs2010 using SilverLight web application. When I press F5, the error is coming : <strong>Error: unable to start debugging. Silverlight developer runtime is not installed. Please install matching version</strong></p>