Fatal error: Uncaught Error: Class 'MetaSlider_Widget' not found in /wp-includes/class-wp-widget-factory.php:62
Stack trace:
#0 /wp-includes/widgets.php(115): WP_Widget_Factory->register('MetaSlider_Widg...')
#1 /wp-content/plugins/ml-slider/ml-slider.php(440): register_widget('MetaSlider_Widg...')
#2 /wp-includes/class-wp-hook.php(324): MetaSliderPlugin->register_metaslider_widget('')
#3 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#4 /wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#5 /wp-includes/widgets.php(1862): do_action('widgets_init')
#6 /wp-includes/class-wp-hook.php(324): wp_widgets_init('')
#7 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#8 /wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#9 /wp-settings.php(695): do_action('init')
#10 /wp-config.php(98): require_once('/wp-settings.ph...')
#11 /wp-load.php(50): require_once('/wp-config.php')
#12 /wp-blog-header.php(13): require_once('/wp-load.php')
#13 /index.php(17): require('/wp-blog-heade in /wp-includes/class-wp-widget-factory.php on line 62