Fatal error: Uncaught Error: Call to undefined function add_action() in /home/artemi19/public_html/test/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php:66 Stack trace: #0 /home/artemi19/public_html/test/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php(51): Jetpack_Site_Icon->register_hooks() #1 /home/artemi19/public_html/test/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php(823): Jetpack_Site_Icon::init() #2 {main} thrown in /home/artemi19/public_html/test/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php on line 66