Fatal error: Uncaught Error: Class 'Nextend\SmartSlider3\Application\Admin\Layout\Block\Forms\Button\BlockButtonPlainIcon' not found in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\SmartSlider3\Application\Admin\Preview\Block\PreviewToolbar\PreviewToolbar.php:36
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\wp-content\plugins\smart-slider-3\Nextend\SmartSlider3\Application\Admin\Preview\Block\PreviewToolbar\PreviewToolbar.php on line 36