{message: "", exception: "Symfony\Component\HttpKernel\Exception\NotFoundHttpException",…}

I'm a newbie in laravel I want to add a product using ajax method but I'm getting this error, in the console, I'm getting POST 404 NOT FOUND and in the network, I'm getting this error message

{message: "", exception: "Symfony\Component\HttpKernel\Exception\NotFoundHttpException",…}

here is my ajax code I can't find the error

<script>
      $(document).ready(function(){
        // alert("working");
        $("#btn").click(function(){
          var prodName = $("#prodName").val();
          var rate = $("#rate").val();
          var beginningQuantity = $("#beginningQuantity").val();
          var token = $("#token").val();

          $.ajax({
            type: "POST",
            data: "prodName=" + prodName + "&rate=" + rate + "&beginningQuantity=" + beginningQuantity + "&_token" + token,
            url: "<?php echo url('/saveProduct') ?>",
            succes:function(data){
              console.log(data);
            }
          });
        });
      });
    </script>

here's the controller codes

public function saveProduct(){
    return $request;
}

via Chebli Mohamed