You do not have the GD Library installed. This class requires the GD library to function properly. visit http://us2.php.net/manual/en/ref.image.php for more information
Fatal error: Uncaught E_No_Image_Library_Exception: The site does not support the GD Image library. Please ask your hosting provider to enable it. in C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DataTypes\LegacyThumbnail.php:134 Stack trace: #0 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DataStorage\Manager.php(365): Imagely\NGG\DataTypes\LegacyThumbnail->__construct('C:/xampp/htdocs...', true) #1 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DataStorage\Manager.php(2495): Imagely\NGG\DataStorage\Manager->generate_image_clone('C:/xampp/htdocs...', 'C:/xampp/htdocs...', Array) #2 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DataStorage\Manager.php(2569): Imagely\NGG\DataStorage\Manager->generate_image_size(Object(stdClass), 'thumbnail', Array, false) #3 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DisplayTypes\Thumbnails.php(396): Imagely\NGG\DataStorage\Manager->generate_thumbnail(Object(stdClass)) #4 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DisplayTypes\Thumbnails.php(117): Imagely\NGG\DisplayTypes\Thumbnails->ensure_thumbnails_exist(Array, Object(Imagely\NGG\DataStorage\Manager)) #5 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DisplayedGallery\Renderer.php(449): Imagely\NGG\DisplayTypes\Thumbnails->index_action(Object(Imagely\NGG\DataTypes\DisplayedGallery), true) #6 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DisplayedGallery\Renderer.php(264): Imagely\NGG\DisplayedGallery\Renderer->render(Object(Imagely\NGG\DataTypes\DisplayedGallery), true) #7 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\Display\DisplayManager.php(720): Imagely\NGG\DisplayedGallery\Renderer->display_images(Array, '') #8 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\Display\Shortcodes.php(386): Imagely\NGG\Display\DisplayManager->display_images(Array, '') #9 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\Display\Shortcodes.php(278): Imagely\NGG\Display\Shortcodes->render_shortcode(Array, Array, '') #10 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\Display\Shortcodes.php(242): Imagely\NGG\Display\Shortcodes->execute_found_shortcode('0') #11 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-includes\class-wp-hook.php(324): Imagely\NGG\Display\Shortcodes->parse_content('ngg_shortcode_0...') #12 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-includes\plugin.php(205): WP_Hook->apply_filters('ngg_shortcode_0...', Array) #13 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-includes\post-template.php(256): apply_filters('the_content', '[ngg_images sou...') #14 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\themes\flat\page.php(14): the_content('Continua a legg...') #15 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-includes\template-loader.php(113): include('C:\\xampp\\htdocs...') #16 C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-blog-header.php(19): require_once('C:\\xampp\\htdocs...') #17 C:\xampp\htdocs\website\rifugiodeffeyes.it\index.php(17): require('C:\\xampp\\htdocs...') #18 {main} thrown in C:\xampp\htdocs\website\rifugiodeffeyes.it\wp-content\plugins\nextgen-gallery\src\DataTypes\LegacyThumbnail.php on line 134