javascript - Ajax error value return null -

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i have function in ajax :

            $.ajax({                     type: "post",                     url: "@url.action("filtralevatamento", "consulta")",                     data: json.stringify(jsn),                     contenttype: "application/json",                     datatype: "json",                     async: true,                     success: function (data) {                              result(data);                            $("#modalboxprocessa").modal("hide");                      },                     error: function (xmlhttprequest, txtstatus, errorthrown) {                         $("#modalboxprocessa").modal("hide");                         $("#modalboxerro2").modal("show");                      }                 });

in local machine works when publish in server error in ajax .

can tell me problem ? have pretty same ajax returning me other data, , running fine .


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