Fatal error: Uncaught Error: Call to undefined function WP_STATISTICS\add_action() in /home/yarhsjou/public_html/wp-content/plugins/wp-statistics/includes/class-wp-statistics-install.php:15 Stack trace: #0 /home/yarhsjou/public_html/wp-content/plugins/wp-statistics/includes/class-wp-statistics-install.php(1037): WP_STATISTICS\Install->__construct() #1 {main} thrown in /home/yarhsjou/public_html/wp-content/plugins/wp-statistics/includes/class-wp-statistics-install.php on line 15