Cannot access empty property

[eluser]benfike[/eluser]
Hi!

I use a Online Library for 1.7.3 CI, but on 2.0 CI and HMVC it wont work, it says:
Fatal error: Cannot access empty property in C:\AppServ\www\application\third_party\MX\Loader.php on line 161

Code:

<?php

/**
* Users Online class
*
* Manages active users
*
* @package        CodeIgniter
* @subpackage    Libraries
* @category    Add-Ons
* @author        Leonardo Monteiro Bersan de Araújo
* @link        hhttp://codeigniter.com/wiki/Library: Online_Users
*/

error_reporting(E_ALL);

class WhoisOnline{
    var $file="usersonline.tmp";
    var $data;
    var $ip;
    
        function __construct(){
        
        $this->ip=$_SERVER['REMOTE_ADDR'];
        $this->data = @unserialize(file_get_contents($this->file));
        if(!$this->data) $this->data=array();
        
        $timeout = time()-120;
        
        //If it's the first hit, add the information to database
        if(!isset($this->data[$this->ip])){
            $this->data[$this->ip]['time'] = time();
            $this->data[$this->ip]['uri'] = $_SERVER['REQUEST_URI'];
            $this->ci =& get_instance();
            //Loads the USER_AGENT class if it's not loaded yet
            if(!isset($CI->agent)) { $CI->load->library('user_agent'); $class_loaded = true; }
            if($CI->agent->is_robot())
                $this->data[$this->ip]['bot'] = $CI->agent->robot();
            else
                $this->data[$this->ip]['bot'] = false;
            
            //Destroys the USER_AGENT class so it can be loaded again on the controller
            if($class_loaded) unset($class_loaded, $CI->agent);
        }
        else
        {
            $this->data[$this->ip]['time'] = time();
            $this->data[$this->ip]['uri'] = $_SERVER['REQUEST_URI'];
        }
        
        //Removes expired data            
        foreach($this->data as $key => $value){
            if($value['time'] <= $timeout) unset($this->data[$key]);
        }
        
        $this->_save();
        
    }
    
    //this function return the total number of online users
    function total_users(){
        return count($this->data);
    }
    //this function return the total number of online robots
    function total_robots(){
        $i=0;
        foreach($this->data as $value)
        {
            if($value['is_robot']) $i++;
        }
        return $i;
    }
    
    //Used to set custom data
    function set_data($data=false, $force_update=false){
        if(!is_array($data)){ return false;}

        $tmp=false; //Used to control if there are changes

        foreach($data as $key => $value)
        {
            if(!isset($this->data[$this->ip]['data'][$key]) || $force_update)
            {
                $this->data[$this->ip]['data'][$key] = $value;
                $tmp=true;
            }
        }
        
        //Check if the user's already have this setting and skips the wiriting file process (saves CPU)
        if(!$tmp) return false;
        return $this->_save();
    }    
    //
    function get_info(){
        return @$this->data;
    }    
    
    //Save current data into file
    function _save()
    {
        $fp = fopen($this->file,'w');
        flock($fp, LOCK_EX);
        $write = fwrite($fp, serialize($this->data));
        fclose($fp);
        //var_dump($this->data);
        return $write;
    }
}

Whats wrong with this?

[eluser]InsiteFX[/eluser]
Your code is wrong for one!

Code:

$this->ci =& get_instance();

// All $CI should be $ci

//Loads the USER_AGENT class if it's not loaded yet
if(!isset($ci->agent)) { $ci->load->library('user_agent'); $class_loaded = true; }