Fatal error: Uncaught Error: Call to undefined method Bittl\View\View::registerABTest() in /usr/www/users/develop/deploy/three.test/includes/header.php:17 Stack trace: #0 /usr/www/users/develop/deploy/three.test/index.php(448): require() #1 {main} thrown in /usr/www/users/develop/deploy/three.test/includes/header.php on line 17