Fatal error: Uncaught Error: Class 'Nextend\Framework\Plugin' not found in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\Framework\Notification\Notification.php:29 Stack trace: #0 C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\Framework\Notification\Notification.php(184): Nextend\Framework\Notification\Notification->__construct() #1 {main} thrown in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\Framework\Notification\Notification.php on line 29