Constant WP_MEMORY_LIMIT already defined in wp-config.php on line

 https://forum.ait-pro.com/forums/topic/constant-wp_memory_limit-already-defined-in-wp-config-php-on-line-130/

This problem is caused by a Theme that added this WP code/constant:  define('WP_MEMORY_LIMIT', '512M'); at the bottom of the wp-config.php file after the require_once(ABSPATH . 'wp-settings.php'); code in the wp-config.php file. No code is supposed to go after this line of code in the wp-config.php file. All custom code in the wp-config.php file needs to be above this line of code.