ACF flexible content block not showing on live site (works locally)

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Seems like you have a PHP error.

Try adding this to the top of your php file that you are having an issue with.

<?php
ini_set('display_errors', '1');
ini_set('display_startup_errors', '1');
error_reporting(E_ALL);
?>

You can also open your wp-config.php and change

define('WP_DEBUG', false);

to

define('WP_DEBUG', true);

Also, it looks like you site is already working.