Fatal error: Uncaught Error: Call to undefined function is_checkout() in /home/linkage2/public_html/wp-content/plugins/woo-checkout-field-editor-pro/classes/class-thwcfd-checkout.php:22 Stack trace: #0 /home/linkage2/public_html/wp-includes/class-wp-hook.php(287): THWCFD_Checkout->enqueue_styles_and_scripts('') #1 /home/linkage2/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #2 /home/linkage2/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #3 /home/linkage2/public_html/wp-includes/script-loader.php(2294): do_action('wp_enqueue_scri...') #4 /home/linkage2/public_html/wp-includes/class-wp-hook.php(287): wp_enqueue_scripts('') #5 /home/linkage2/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #6 /home/linkage2/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #7 /home/linkage2/public_html/wp-includes/general-template.php(2884): do_action('wp_head') #8 /home/linkage2/public_html/wp-content/themes/flatsome/header.php(12) in /home/linkage2/public_html/wp-content/plugins/woo-checkout-field-editor-pro/classes/class-thwcfd-checkout.php on line 22