Fatal error: Uncaught Error: Call to undefined function add_shortcode() in C:\xampp\htdocs\krustpilsbaznica.lv\public_html\wp-content\plugins\simple-youtube-shortcode\simple-youtube-shortcode.php:74 Stack trace: #0 {main} thrown in C:\xampp\htdocs\krustpilsbaznica.lv\public_html\wp-content\plugins\simple-youtube-shortcode\simple-youtube-shortcode.php on line 74