Fatal error: Uncaught Error: Call to undefined function WPO\IPS\as_schedule_recurring_action() in /home/mbhm1/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Semaphore.php:406 Stack trace: #0 /home/mbhm1/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Semaphore.php(417): WPO\IPS\Semaphore::schedule_semaphore_cleanup() #1 /home/mbhm1/public_html/wp-includes/class-wp-hook.php(324): WPO\IPS\Semaphore::init_cleanup('') #2 /home/mbhm1/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #3 /home/mbhm1/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /home/mbhm1/public_html/wp-settings.php(704): do_action('init') #5 /home/mbhm1/public_html/wp-config.php(90): require_once('/home/mbhm1/pub...') #6 /home/mbhm1/public_html/wp-load.php(50): require_once('/home/mbhm1/pub...') #7 /home/mbhm1/public_html/wp-blog-header.php(13): require_once('/home/mbhm1/pub...') #8 /home/mbhm1/public_html/index.php(17): require('/home/mbhm1 in /home/mbhm1/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/includes/Semaphore.php on line 406