Fatal error: Uncaught Error: Call to undefined function add_action() in /home/kacperg/public_html/kacpergr/wp-content/plugins/jetpack/modules/simple-payments/simple-payments.php:51 Stack trace: #0 /home/kacperg/public_html/kacpergr/wp-content/plugins/jetpack/modules/simple-payments/simple-payments.php(33): Jetpack_Simple_Payments->register_init_hooks() #1 /home/kacperg/public_html/kacpergr/wp-content/plugins/jetpack/modules/simple-payments/simple-payments.php(565): Jetpack_Simple_Payments::getInstance() #2 {main} thrown in /home/kacperg/public_html/kacpergr/wp-content/plugins/jetpack/modules/simple-payments/simple-payments.php on line 51