Fatal error: Uncaught Error: Call to undefined function is_product() in /home/wrfg5355/public_html/wp-content/themes/on-air/header.php:35 Stack trace: #0 /home/wrfg5355/public_html/wp-includes/template.php(704): require_once() #1 /home/wrfg5355/public_html/wp-includes/template.php(653): load_template('/home/wrfg5355/...', true) #2 /home/wrfg5355/public_html/wp-includes/general-template.php(41): locate_template(Array, true) #3 /home/wrfg5355/public_html/wp-content/themes/on-air/single.php(7): get_header() #4 /home/wrfg5355/public_html/wp-includes/template-loader.php(77): include('/home/wrfg5355/...') #5 /home/wrfg5355/public_html/wp-blog-header.php(19): require_once('/home/wrfg5355/...') #6 /home/wrfg5355/public_html/index.php(17): require('/home/wrfg5355/...') #7 {main} thrown in /home/wrfg5355/public_html/wp-content/themes/on-air/header.php on line 35