Fatal error: Uncaught Error: Call to undefined function get_header() in C:\xampp\htdocs\wordpress\wp-content\themes\gwt-wordpress-gwt-wordpress-26.0.0\index.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wordpress\wp-content\themes\gwt-wordpress-gwt-wordpress-26.0.0\index.php on line 15