Cronjob scheduled but not executing.

Method to Execute at Certain Interval

function informant_main_action(){
    die('working');
}

Custom Schedule for Cron Job

function my_cron_definer($schedules){
        $schedules['weekly'] = array('interval'=> 120, //604800
            'display'=>  __('Once Every week')
            );
        return $schedules;
    }

add_filter('cron_schedules','my_cron_definer');

Register schedule on plugin activation

register_activation_hook( __FILE__, 'informant_run_on_activation' );

function informant_run_on_activation(){
    if(!wp_next_scheduled('informantweeklynewsletter')){
        wp_schedule_event(time(), 'weekly', 'informantweeklynewsletter');
    }
}

Calling my method to be executed on custom event

add_action('informantweeklynewsletter','informant_main_action');

I have installed a plugin Cron Gui for viewing scheduled cronjob and it is listing my event correctly as i put the recurrence for every two minutes the cron gui shows the correct result i.e its updating the time +2 minutes.

But my method informant_main_action() is not working. Whats the mistake i am making. ?

Thanks