Can I put two libraries in one session?

var res_flags = wialon.item.Item.dataFlag.base | wialon.item.Resource.dataFlag.reports;
    var unit_flags = wialon.item.Item.dataFlag.base | wialon.item.Unit.dataFlag.sensors | wialon.item.Unit.dataFlag.lastMessage;
        
        
        
        
        var sess = wialon.core.Session.getInstance(); // get instance of current Session
        sess.loadLibrary("resourceReports"); // load Icon Library
        //sess.loadLibrary("unitSensors");
        sess.updateDataFlags( // load items to current session
            [{
                type: "type", 
                data: "avl_resource", 
                flags:res_flags , 
                mode: 0
            }, // especificación del recurso
        {
                    type: "type", 
                    data: "avl_unit", 
                    flags: unit_flags, 
                    mode: 0
                }], // especificacion de unidades
                    
                function (code) { // updateDataFlags callback
                    if (code) { 
                        msg(wialon.core.Errors.getErrorText(code)); 
                        return; 
                    } // exit if error code
                    
/******************************************************************************************************************************/
                 
                var res = sess.getItems("avl_resource");
                if(!res || !res.length){
                    msg("Resources not found");
                    return;
                }
                
                for (var i = 0; i< res.length; i++) // construct Select object using found resources
                    $("#res").append("<option value='" + res[1].getId() + "'>" + res[1].getName() + "</option>");

        getTemplates(); // update report template list
            
        $("#res").change( getTemplates ); // bind action to select change
                
                 // get loaded 'avl_unit's items 
            var units = sess.getItems("avl_unit");
            if (!units || !units.length){ 
                    msg("Units not found"); 
                    return; 
                } // check if units found

            for (var i = 0; i< units.length; i++){ // construct Select object using found units
                var u = units[i]; // current unit in cycle
                // append option to select
                $("#units").append("<option value='"+ u.getId() +"'>"+ u.getName()+ "</option>");
            }
                        
                        //getSensors(); // get Sensors for currently selected unit
            // bind actions to selects 
            //$("#units").change( getSensors );
                        // getSensors(); // get Sensors for currently selected unit
            // bind actions to selects 
            //$("#units").change( getSensors ); 
            //$("#sensors").change( getSensorInfo );
            // bind action to select change event
            $("#units").change( getSelectedUnitInfo );
                
                
        }
    );
        var sess1 = wialon.core.Session.getInstance();
        sess1.loadLibrary("unitSensors");
        sess1.updateDataFlags(
                [//pecificación del recurso
        {
                    type: "type", 
                    data: "avl_unit", 
                    flags: unit_flags, 
                    mode: 0
                }], // especificacion de unidades
                    
                function (code) { // updateDataFlags callback
                    if (code) { 
                        msg(wialon.core.Errors.getErrorText(code)); 
                        return; 
                    } // exit if error code
                    
                    var units = sess1.getItems("avl_unit");
            if (!units || !units.length){ 
                    msg("Units not found"); 
                    return; 
                } // check if units found

            for (var i = 0; i< units.length; i++){ // construct Select object using found units
                var u = units[i]; // current unit in cycle
                // append option to select
                $("#units").append("<option value='"+ u.getId() +"'>"+ u.getName()+ "</option>");
            }
                        
                         getSensors(); // get Sensors for currently selected unit
            // bind actions to selects 
            $("#units").change( getSensors ); 
            
            // bind action to select change event
            //$("#units").change( getSelectedUnitInfo );
                
                
        }
            );