C# ASP.net page does not open

Good afternoon, can you help me figure out the ASP.net code? I got it from a giant developer, the problem is that the “Admin” page does not open. That is, after starting the application - the default page “PlanEntuty” opens, because it tries to go to the “Administrator” page - an error 404 occurs, although everything is in place. If in the files “HomeController.cs” change in the line “return RedirectToAction(“Index”, “PlanEntity”);” on “PlanAdmin” - the same error occurs