Custom Champe Knight

Fatal error: Uncaught Error: Call to undefined function types_render_field() in /www/westartusacom_931/public/wp-content/themes/storefront-child/functions.php:102 Stack trace: #0 /www/westartusacom_931/public/wp-includes/class-wp-hook.php(324): custom_meta_product_plate('') #1 /www/westartusacom_931/public/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #2 /www/westartusacom_931/public/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /www/westartusacom_931/public/wp-content/plugins/woocommerce/templates/content-single-product.php(60): do_action('woocommerce_sin...') #4 /www/westartusacom_931/public/wp-includes/template.php(792): require('/www/westartusa...') #5 /www/westartusacom_931/public/wp-content/plugins/woocommerce/includes/wc-core-functions.php(284): load_template('/www/westartusa...', false) #6 /www/westartusacom_931/public/wp-content/plugins/woocommerce/templates/single-product.php(37): wc_get_template_part('content', 'single-product') #7 /www/westartusacom_931/public/wp-includes/template-loader.php(106): include('/www/westartusa...') #8 /www/westartusacom_931/public/wp-blog-header.php(19): require_once('/www/westartusa...') #9 /www/westartusacom_931/public/index.php(17): require('/www/westartusa...') #10 {main} thrown in /www/westartusacom_931/public/wp-content/themes/storefront-child/functions.php on line 102