UPFRONT EDITOR WILL NOT SAVE, "THERE HAS BEEN AN ERROR SAVING YOUR CHANGES"

Hey guys,

Getting the error: "THERE HAS BEEN AN ERROR SAVING YOUR CHANGES"

as per another thread I have tried adding the following to wp-config.php. But not resolved...

@ini_set( 'post_max_size', '512M');
define('WP_MEMORY_LIMIT', '256M');