Hi @calmond
I was able to take a look at the site itself; currently the wp-config.php file has a set of constants, including WP_CRON_LOCK_TIMEOUT, loading after this section:
/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
define('ABSPATH', dirname(__FILE__) . '/');
/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');
Can you please move these lines before this line in wp-config.php?
/* That's all, stop editing! Happy blogging. */
Then clear caches for the site. I believe that should resolve these errors you’re receiving.