Thread

class System {
    
    var $CI;
    
    /**
     * Constructor
     *
     */    
    function System()
    {    
        $this->CI =& get_instance();
        log_message('debug', "System Class Initialized");
    }

function backupDB($db_backup_path='./backups_db/', $db_name='dbname') 
    {
        // Load the DB utility class
        $this->CI->load->dbutil();
        
        $time = date('d-m-Y_H-i-s');
        $filename = $db_name.'_'.$time;
        
        $prefs = array(    'tables'        => array(),
                        'format'        => 'zip',             // gzip, zip, txt
                        'filename'        => $filename .'.sql',   // File name - NEEDED ONLY WITH ZIP FILES
                        'add_drop'        => FALSE,              // Whether to add DROP TABLE statements to backup file
                        'add_insert'    => TRUE,              // Whether to add INSERT data to backup file
                        'newline'        => "\n"               // Newline character used in backup file
                      );
        
        $do = $this->CI->dbutil->backup($prefs); // <-- SCRIPT CHOKES HERE
        
        // Backup your entire database and assign it to a variable
        $backup =& $do;
        
        // Load the file helper and write the file to your server
        $this->CI->load->helper('file');
        
        if (write_file($db_backup_path . $filename .'.sql.zip', $backup)) 
        {
            return TRUE;
        }
    }
}

Fatal error: Call to a member function userdata() on a non-object in C:\WebServer\fqxxnlyw\public_html\system\application\libraries\Messaging.php on line 20

$uid = $CI->session->userdata('uid');

function __construct(){
        $CI =& get_instance();
        $CI->load->database();    
        $CI->load->library('parser');
        $CI->load->helper('url');
        $CI->load->library('session');
        $CI->load->library('user_agent');
        $CI->load->library('validation');
        $CI->load->library('encrypt');
        $CI->load->library('email');
        $CI->load->helper(array('form', 'url'));
    }