Fatal error: Uncaught Error: Class 'Nextend\Framework\Asset\Css\Less\Formatter\Classic' not found in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\Framework\Asset\Css\Less\Formatter\Debug.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\Framework\Asset\Css\Less\Formatter\Debug.php on line 7