asp.net mvc - Errors when passing data via jquery ajax -

i have pretty simple ajax request i'm sending on server in order data , fill edit modal. reason keeps returning error , can't figure out why. i've debugged server side, parameter comes in correctly , data found , returned, still error though.

here's code might see missing here.

request:

function editnorm(id) {     $.ajax({         type: "post",         url: "@url.action("getnormviewmodel")",         datatype: 'json',         contenttype: 'application/json; charset=utf-8',         data: json.stringify({id : id}),         cache: false,         success: function(data) {             fillformforediting(data.nvm);         },         error: function() {             alert("error on editnorm function");         }     }); } 

server side:

public jsonresult getnormviewmodel(int id)     {         var nvm = new normviewmodel {norm = db.norms.find(id), materials = db.materials.tolist()};          return json(new {nvm = nvm}, jsonrequestbehavior.allowget);     } 

firstly: using post method on javascript while controller accepts get, add action:

[httppost] public jsonresult getnormviewmodel(int id) {    return json(new { ... }); } 

secondly: db linqtosql / entity framework context? if so, make sure no call data context performed after data returned. (i.e. changed action , return return json(new { nvm = "test" }); , console.log/alert make sure you've got result back. tells model failed when it's returned due late binding.