Fatal error: Uncaught Error: Class "Nextend\Framework\View\AbstractViewAjax" not found in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Application/Admin/Slider/ViewAjaxSliderBox.php:8 Stack trace: #0 {main} thrown in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Application/Admin/Slider/ViewAjaxSliderBox.php on line 8