Problem compiling demos

Hi , I downloaded and installed aspose excel.
When I try to open the project in : C:\Program Files\Aspose\Aspose.Excel\Demos\Aspose.Excel.Demos I get the following error:
“VS.net can not create or open the application. The likeliest problem is that required components are not installed on the local web server. Run VS.net setup and add the web development component”

Thanks in advance for your help.

Please check the attached screenshot. Have you added reference to Aspose.Excel?