jQuery Grid Plugin - jqGrid

Hello Tony and all,

I am trying to work out using last version of JqGrid 4.3.1 under IIS and Microsoft SQL Server platform using PHP+Javascript and I created a grid correctly. Just when I click to add record and I insert data, once I click to Submit using Firebug I get a POST successful with OK 200ms but it doesn't save anything and I see in XML tab response this kind of error:

XML Parsing Error: no element found Location: moz-nullprincipal:{...} Line Number 1, Column 1:

What could be?

The piece of js code to manage the grid is:

jQuery(document).ready(function(){	
    jQuery("#userstable").jqGrid({
        url:"load_datatable.php?table_name=users&fact=add",
        datatype: 'json',
        colNames:['ID','Last Name','First Name','Account','Password'],
        colModel:[
            {name:'ID',index:'ID',width:1,editable:false,hidden:true},
            {name:'Last_Name',index:'Last_Name',width:150,editable:true,editoptions:{readonly:false,size:40}},
            {name:'First_Name',index:'First_Name',width:150,editable:true,editoptions:{readonly:false,size:40}},
            {name:'Account',index:'Account',width:120,editable:true,editoptions:{readonly:false,size:40}},
            {name:'Password',index:'Password',width:120,editable:true,editoptions:{readonly:false,size:40}},
        ],
        rowNum:10, 
        rowList:[10,20,30],
        loadonce:false,
        pager: '#pagerusers', 
        emptyrecords: 'No users found',
        sortname: 'Last_Name', 
        viewrecords: true, 
        sortorder: "desc", 
        caption:"Users",
        editurl:"edit_datatable.php?table_name=users&fact=add",
        shrinkToFit: false // autowidth: true,
    }).navGrid('#pagerusers',{
        edit:true,edittext:'Edit',edittitle:'Edit selected user...',
        add:true,addtext:'Add',addtitle:'Add new user...',
        del:true,deltext:'Remove',deltitle:'Remove selected user...',
        search:true,searchtext:'Find',searchtitle:'Find user...',
        refresh:true,refreshtext:'Reload',refreshtitle:'Reload users...'
    }, 
    {addfunc:function(){jQuery('#userstable').editGridRow("new",{height:180,width:400,reloadAfterSubmit:true,closeOnEscape:true});},
     editfunc:function(){var rowids=jQuery('#userstable').jqGrid('getCol','ID',false);var idsel=jQuery('#userstable').jqGrid('getGridParam','selrow');var id=rowids[idsel];jQuery('#userstable').editGridRow(idsel,{height:180,width:250,url:"edit_datatable.php?table_name=users&fact=edit&id="+id,reloadAfterSubmit:true,closeOnEscape:true});},
     delfunc:function(){var rowids=jQuery('#userstable').jqGrid('getCol','ID',false);var idsel=jQuery('#userstable').jqGrid('getGridParam','selrow');var id=rowids[idsel];jQuery('#userstable').delGridRow(idsel,{url:"edit_datatable.php?table_name=users&fact=del&id="+id,reloadAfterSubmit:true,closeOnEscape:true});},refresh:true,search:true}, //options 
    {height:180,width:400,reloadAfterSubmit:true,bSubmit:'Save',recreateForm:true}, // edit options 
    {height:180,width:400,reloadAfterSubmit:true,bSubmit:'Save',recreateForm:true}, // add options 
    {reloadAfterSubmit:true}, // del options
    {});
});

which it looks like just ok.

Any trick is appreciate.. thanks

Luigi