Fatal error: Uncaught Error: Call to undefined function WPO\IPS\as_schedule_recurring_action() in /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Semaphore.php:406 Stack trace: #0 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Semaphore.php(417): WPO\IPS\Semaphore::schedule_semaphore_cleanup() #1 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-includes/class-wp-hook.php(341): WPO\IPS\Semaphore::init_cleanup('') #2 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #3 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #4 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-settings.php(742): do_action('init') #5 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-config.php(103): require_once('/data01/virt124...') #6 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-load.php(50): require_once('/data01/virt124...') #7 /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-blog-header.php(13): require_once('/data01/virt124...') #8 /data01/virt124334/domeenid/www.valika.eu/htdocs/index.php(17): require('/data01/virt124...') #9 {main} thrown in /data01/virt124334/domeenid/www.valika.eu/htdocs/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Semaphore.php on line 406