Fatal error: Uncaught Error: Call to undefined function add_action() in C:\xampp\htdocs\wp-content\plugins\wp-timelines\inc\admin\cmb2\init.php:126 Stack trace: #0 C:\xampp\htdocs\wp-content\plugins\wp-timelines\inc\admin\cmb2\init.php(103): CMB2_Bootstrap_242->__construct() #1 C:\xampp\htdocs\wp-content\plugins\wp-timelines\inc\admin\cmb2\init.php(191): CMB2_Bootstrap_242::initiate() #2 C:\xampp\htdocs\wp-content\plugins\wp-timelines\inc\admin\metadata-functions.php(19): require_once('C:\\xampp\\htdocs...') #3 C:\xampp\htdocs\wp-content\plugins\wp-timelines\inc\admin\class-timeline-post-type.php(2): include('C:\\xampp\\htdocs...') #4 {main} thrown in C:\xampp\htdocs\wp-content\plugins\wp-timelines\inc\admin\cmb2\init.php on line 126