Fatal error: Uncaught Error: Call to undefined function is_product() in /dom53786/wp-content/themes/doortodoorcabinets/inc/custom-schema.php:255 Stack trace: #0 /dom53786/wp-includes/class-wp-hook.php(324): d2d_add_custom_meta_to_product_page('') #1 /dom53786/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #2 /dom53786/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /dom53786/wp-includes/general-template.php(3064): do_action('wp_head') #4 /dom53786/wp-content/themes/doortodoorcabinets/header.php(5): wp_head() #5 /dom53786/wp-includes/template.php(810): require_once('/dom53786/wp-co...') #6 /dom53786/wp-includes/template.php(745): load_template('/dom53786/wp-co...', true, Array) #7 /dom53786/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #8 /dom53786/wp-content/themes/doortodoorcabinets/front-page.php(1): get_header() #9 /dom53786/wp-includes/template-loader.php(106): include('/dom53786/wp-co...') #10 /dom53786/wp-blog-header.php(19): require_once('/dom53786/wp-in...') #11 /dom53786/index.php(17): require('/dom53786/wp-bl...') #12 {main} thrown in /dom53786/wp-content/themes/doortodoorcabinets/inc/custom-schema.php on line 255