Fatal error: Uncaught Error: Call to undefined function add_action() in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/markdown/easy-markdown.php:877
Stack trace:
#0 /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/markdown.php(17): require()
#1 {main}
thrown in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/markdown/easy-markdown.php on line 877