Fatal error: Uncaught Error: Call to undefined function is_product() in /home3/manuals/public_html/wp-content/themes/generatepress_child/functions.php:429 Stack trace: #0 /home3/manuals/public_html/wp-includes/class-wp-hook.php(324): quantity_wp_head('') #1 /home3/manuals/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #2 /home3/manuals/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /home3/manuals/public_html/wp-includes/general-template.php(3192): do_action('wp_head') #4 /home3/manuals/public_html/wp-content/themes/generatepress/header.php(16): wp_head() #5 /home3/manuals/public_html/wp-includes/template.php(810): require_once('/home3/manuals/...') #6 /home3/manuals/public_html/wp-includes/template.php(745): load_template('/home3/manuals/...', true, Array) #7 /home3/manuals/public_html/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #8 /home3/manuals/public_html/wp-content/themes/generatepress/page.php(17): get_header() #9 /home3/m in /home3/manuals/public_html/wp-content/themes/generatepress_child/functions.php on line 429