title: Error in jqGrid - TypeError: Cannot read property 'id' of null
body: <p>I am experiencing an issue while working with jqGrid . Its showing Loading... and the browser console shows the following. </p>
  
  <pre><code>    Uncaught TypeError:  Cannot read property 'id' of null
  at Object.getAccessor (jquery.jqGrid.4.4.1.min.js:15)
  at $ (jquery.jqGrid.4.4.1.min.js:60)
  at G (jquery.jqGrid.4.4.1.min.js:76)
  at HTMLTableElement.&lt;anonymous&gt; (jquery.jqGrid.4.4.1.min.js:127)
  at Function.each (jquery-1.8.3.min.js:2)
  at init.each (jquery-1.8.3.min.js:2)
  at init.b.fn.jqGrid (jquery.jqGrid.4.4.1.min.js:30)
  at loadMyGrid (taggingSheepWelfare.js:5)
  at HTMLDocument.&lt;anonymous&gt; (displaySummary.do:2822)
  at l (jquery-1.8.3.min.js:2)
  </code></pre>
  
  <p>and here is the jqgrid that i have used. </p>
  
  <pre><code>function loadMyGrid(tagData){
  var tagDataJson = { "id" : "sequenceNumber", "page" : "1","records" : 0, "rows" : JSON.parse(tagData)};
  
  $("#myTable").jqGrid({
            datatype : "jsonstring",
          datastr : tagDataJson,
          jsonReader : { repeatitems : false},
          height: "100%",
          width: "70%",       
          rowNum : 6,
          loadonce : true,
          gridview : true,
          viewrecords : true,
          scrollOffset: 0,
          emptyrecords : "Nothing to display",
          pgbuttons : true,
          pginput : true,
          ignoreCase: true, 
          localReader : {id:'sequenceNumber'}, 
          pgtext : "Page {0} of {1}",
          loadtext : "Loading...",
      colNames : ['sequenceNumber', 'Tag No', 'ColumnA' ,  'ColumnB', 'ColumnC'],   
      colModel: [
  
            { name: 'sequenceNumber', index:'sequenceNumber',align:'center', width: 130, hidden:true},/*sortable:false*/
            { name: 'tagNo', index:'tagNo', align:'center', width: 130},
            { name: 'a', index:'a', align:'center', width: 90},
            { name: 'b', index:'b', align:'center', width: 90},
            { name: 'c', index:'c', align:'center', width: 90 },
      ],
       pager: "#SampleGridPager",
      caption: "&amp;nbsp;Tag Grid",
      hidegrid: false
  });
  $("#myTable").jqGrid('filterToolbar', { stringResult: true , defaultSearch: "cn" });
  </code></pre>
  
  <p>}</p>
  
  <p>Not able to figure out the issue here  . </p>