Fatal error: Uncaught Error: Call to undefined function add_action() in D:\project\htdocs\sdgs\wp-content\themes\seedlet\inc\customizer.php:25 Stack trace: #0 D:\project\htdocs\sdgs\wp-content\themes\seedlet\inc\customizer.php(221): Seedlet_Customize->__construct() #1 {main} thrown in D:\project\htdocs\sdgs\wp-content\themes\seedlet\inc\customizer.php on line 25