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Hi, you have doubled the function esc_htmlesc_html_e
PHP Fatal error: Uncaught Error: Call to undefined function esc_htmlesc_html_e() in /home5/***/public_html/wp-content/plugins/twenty20/inc/widget-twenty20.php:101
Stack trace:
#0 /home5/***/public_html/wp-includes/class-wp-widget.php(535): twenty20_slider_widget->form()
#1 /home5/***/public_html/wp-admin/includes/widgets.php(276): WP_Widget->form_callback()