error : Strict standards: Declaration of eo_mobile_Walker_Nav_Menu

I turn in false the debug mod and to OFF the Custom markup.

Here the last error :

Strict standards: Declaration of eo_mobile_Walker_Nav_Menu::start_lvl() should be compatible with Walker::start_lvl(&$output, $depth = 0, $args = Array) in D:\wamp\www\wordpress380\wp-content\themes\bootstrap-ultimate\inc\core\mobile_menu_nav_walker.php on line 109

Strict standards: Declaration of eo_mobile_Walker_Nav_Menu::start_el() should be compatible with Walker::start_el(&$output, $object, $depth = 0, $args = Array, $current_object_id = 0) in D:\wamp\www\wordpress380\wp-content\themes\bootstrap-ultimate\inc\core\mobile_menu_nav_walker.php on line 109