Cannot implicitly convert type 'System.Web.Mvc.ViewResult' to 'Microsoft.AspNetCore.Mvc.IActionResult' - Asp.Net MVC 5

Question

I\'m using ASP.NET MVC 5, I\'m trying to return a view but I\'m getting the error "Cannot implicitly convert type \'System.Web.Mvc.ViewResult\' to \'Microsoft.AspNetCor