Fatal error: Uncaught Error: Call to undefined function add_action() in /homepages/19/d621719403/htdocs/blog/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php:66 Stack trace: #0 /homepages/19/d621719403/htdocs/blog/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php(51): Jetpack_Site_Icon->register_hooks() #1 /homepages/19/d621719403/htdocs/blog/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php(829): Jetpack_Site_Icon::init() #2 {main} thrown in /homepages/19/d621719403/htdocs/blog/wp-content/plugins/jetpack/modules/site-icon/jetpack-site-icon.php on line 66