Fatal error: Uncaught Error: Call to undefined function Automattic\Jetpack\Extensions\WhatsApp_Button\add_action() in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/extensions/blocks/send-a-message/whatsapp-button/whatsapp-button.php:31 Stack trace: #0 /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/extensions/blocks/send-a-message/send-a-message.php(10): require_once() #1 {main} thrown in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/extensions/blocks/send-a-message/whatsapp-button/whatsapp-button.php on line 31