Cron job issue - No direct script access allowed

Hi, I'm having trouble getting a cron job to run:

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The file that I need the cron to run is located at:

Code:

/home/user/public_html/application/modules/cron/controllers/cron.php

The command for the cron is:

Code:

/usr/local/bin/php /home/user/public_html/application/modules/cron/controllers/cron.php Cron index

The file cron.php contains:
<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Cron extends Front_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->model('cron_model');
    }

    public function index() {
        $this->check_on_grace_period(); //checks for grace period if passed disable account
    }
}

The error after the cron runs is:
No direct script access allowed

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What am I doing wrong?  Any help would be amazing, thanks