C# : Unable to cast object of type 'ASP._Page_Areas_Admin__ViewStart_cshtml' to type 'System.Web.Web

C# : Unable to cast object of type 'ASP._Page_Areas_Admin__ViewStart_cshtml' to type 'System.Web.WebPages.StartPage'
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C# : Unable to cast object of type 'ASP._Page_Areas_Admin__ViewStart_cshtml' to type 'System.Web.WebPages.StartPage'
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cast to : object of 'System.Web.WebPages.StartPage' Unable type C# type to 'ASP._Page_Areas_Admin__ViewStart_cshtml'