Advanced custom fields not showing with ACF pro

I am trying to make a couple of advanced fields to show in my live site (running ACF pro) from my local (free ACF) using the following syntax:

<h1><?php the_field('homepage_header'); ?></h1>

However the h1 tag shows as empty. Is there a way to display the fields in ACF pro version 5.3.1 that is different from the free version (Version 4.4.4)?

via Chebli Mohamed