Fatal error: Uncaught Error: Call to undefined function is_checkout() in /wp-content/themes/doctorbrew/page.php:3 Stack trace: #0 /wp-includes/template-loader.php(106): include() #1 /wp-blog-header.php(19): require_once('/wp-includes/te...') #2 /index.php(17): require('/wp-blog-header...') #3 {main} thrown in /wp-content/themes/doctorbrew/page.php on line 3