MVC - Fix the following error: The current request for action 'Index' on controller type '' is ambiguous between the following action methods:

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The current request for action 'Index' on controller type '' is ambiguous between the following action methods:

To fix it replace
      public ActionResult Index(Customer model)
        {
            return View(db.Customers.ToList());
        }
with
      [HttpPost]
      public ActionResult Index(Customer model)
        {
            return View(db.Customers.ToList());
        }