Fatal error: Uncaught Error: Call to undefined function add_action() in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/memberships/class-jetpack-memberships.php:195 Stack trace: #0 /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/memberships/class-jetpack-memberships.php(152): Jetpack_Memberships->register_init_hook() #1 /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/memberships/class-jetpack-memberships.php(821): Jetpack_Memberships::get_instance() #2 {main} thrown in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/memberships/class-jetpack-memberships.php on line 195