Unknown server tag 'asp:Silverlight'

I am getti开发者_运维技巧ng the error above when I run a solution developed in Visual Studio 2010 and using Silverlight 4. Does anyone know the solution to this?

The asp:Silverlight tag was removed from the SDK on release of Silverlight 3. You need to be using the html <object> tag directly. Review the contents of the test host page the Visual Studio creates when you create a new Silverlight solution.