Hi motiv_studio,

This is a problem with Revolution Slider and we have just submitted a ticket on their support system as we also have had this issue yesterday with one of our theme demos, we will let you know when they come up with a fix to this.

Hi there,

This is the last message we got from them, when they reply us or fix the issue we will let you know!

(view large version)

Hi again,

This is the reply we got from Rev. Slider team:

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It is not error but it is just notice and it is displayed because your site was not able to force disable them so simply edit wp-config.php file of your site and replace below line 

define('WP_DEBUG', false);

With this :-

ini_set('log_errors','On');
ini_set('display_errors','Off');
ini_set('error_reporting', E_ALL );
define('WP_DEBUG', false);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);