Fatal error: Uncaught Error: Class 'Nextend\Framework\Router\Base\PlatformRouter' not found in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\Framework\Router\WordPress\WordPressRouter.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\Framework\Router\WordPress\WordPressRouter.php on line 7