Error callback being called when getting 200

Question

I'm using Canjs on my app and when i call my function, the error callback is being called, but I'm getting a 200 response.

    var factory = new DTO(Factory);

    factory.save(
         function (data) {                                      
             self.element.html(can.view('viewDTO', {}));

         },
                function (error) {
                    console.log(error);
                }
        );

What am I doing wrong?