Fatal error: Uncaught Error: Class 'Kendo\SerializableObject' not found in /var/www/sites/for_new_app/kendophp/php/lib/Kendo/UI/SliderTooltip.php:5 Stack trace: #0 {main} thrown in /var/www/sites/for_new_app/kendophp/php/lib/Kendo/UI/SliderTooltip.php on line 5