Fatal error: Uncaught Error: Call to undefined function register_activation_hook() in /home/Iska/public_html/czwarnog/wp-content/plugins/wpforms-lite/includes/class-install.php:20 Stack trace: #0 /home/Iska/public_html/czwarnog/wp-content/plugins/wpforms-lite/includes/class-install.php(179): WPForms_Install->__construct() #1 {main} thrown in /home/Iska/public_html/czwarnog/wp-content/plugins/wpforms-lite/includes/class-install.php on line 20