wp_schedule_event not firing

I'm trying to schedule an event inside a theme's `functions.php` but I cannot get it to "fire". I'm using the Cron View plugin and it shows the event scheduled correctly but nothing happened when is time to execute.

This is my code

if ( ! wp_next_scheduled( 'prefix_hourly_event' ) ) {
wp_schedule_event( time(), 'hourly', 'prefixhourlyevent');
}
add_action( 'prefixhourlyevent', 'prefix_do_this_hourly' );

function prefix_do_this_hourly() {
wp_mail('[email protected]','Cron is working', 'Cron is working: ','','');
}

You can manually run WordPress cron jobs by going to

[To see links please register here]

. This is where you will be able to see any errors that your scripts creates, really useful when debugging wp scheduled tasks.