Quote Generator

Fatal error: Uncaught Error: Call to undefined function get_sub_field() in /home/.sites/855/site2098410/web/wordpress/wp-content/plugins/quote-generator/quote-generator.php:53 Stack trace: #0 /home/.sites/855/site2098410/web/wordpress/wp-includes/shortcodes.php(356): quote_form('', '', 'quote-generator') #1 [internal function]: do_shortcode_tag(Array) #2 /home/.sites/855/site2098410/web/wordpress/wp-includes/shortcodes.php(228): preg_replace_callback('/\\[(\\[?)(quote\\...', 'do_shortcode_ta...', '[quote-generato...') #3 /home/.sites/855/site2098410/web/wordpress/wp-content/plugins/js_composer/include/helpers/helpers.php(240): do_shortcode('[quote-generato...') #4 /home/.sites/855/site2098410/web/wordpress/wp-content/plugins/js_composer/include/templates/shortcodes/vc_column.php(94): wpb_js_remove_wpautop('[quote-generato...') #5 /home/.sites/855/site2098410/web/wordpress/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(271): require('/home/.sites/85...') #6 /home/.sites/855/site2 in /home/.sites/855/site2098410/web/wordpress/wp-content/plugins/quote-generator/quote-generator.php on line 53