Fatal error: Uncaught Error: Call to undefined function Gutenberg_Courses\Example_Blocks\add_action() in /home/zoilbygr/public_html/wp-content/plugins/revslider/includes/gutenberg-blocks/lib/customizer.php:118 Stack trace: #0 {main} thrown in /home/zoilbygr/public_html/wp-content/plugins/revslider/includes/gutenberg-blocks/lib/customizer.php on line 118