Fatal error: Uncaught Error: Call to undefined function add_action() in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/related-posts.php:42
Stack trace:
#0 /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/related-posts.php(30): Jetpack_RelatedPosts_Module->__construct()
#1 /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/related-posts.php(66): Jetpack_RelatedPosts_Module::instance()
#2 {main}
thrown in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/related-posts.php on line 42