jQuery Grid Plugin - jqGrid

I am trying to use the JQuery plugin jqGrid with an asp .net mvc app.

I am passing the grid a JSON object in the following format as in the jqGrid documentation:

{

“total”:1,

“page”:1,

“records”:10,

“rows”:

[{

"i":1,"cell":["Test","Testical"]},

      {”i”:2,”cell”:["Test1","Testical"]},

      {”i”:3,”cell”:["Test2","Testical"]}]

}

and the jqGrid is setup:

jQuery(”#searchResults”).jqGrid({

                    url: '/Customer/SearchResults/',

                    datatype: 'json',

                    mtype: 'GET',

                    colNames: ['Surname', 'Forename'],

                    colModel: [

                      { name: 'Surname', index: 'Surname', width: 200, align: 'left' },

                      { name: 'Forename', index: 'Forename', width: 200, align: 'left'}],

                    pager: jQuery('#pager'),

                    rowNum: 10,

                    rowList: [5, 10, 20, 50],

                    sortname: 'Id',

                    sortorder: “desc”,

                    viewrecords: true,

                    imgpath: '/scripts/themes/coffee/images',

                    caption: 'My first grid'

                });

Its hitting my action but the grid is stuck on loading, any ideas what I am doing wrong??

Thanks