Fatal error: Uncaught Error: Class "ActionScheduler_QueueCleaner" not found in /htdocs/wp-content/plugins/mailpoet/vendor/woocommerce/action-scheduler/classes/abstracts/ActionScheduler_Abstract_QueueRunner.php:12
Stack trace:
#0 /htdocs/wp-content/plugins/mailpoet/vendor/woocommerce/action-scheduler/classes/ActionScheduler_QueueRunner.php(17): ActionScheduler_Abstract_QueueRunner->__construct(NULL, NULL, NULL)
#1 /htdocs/wp-content/plugins/mailpoet/vendor/woocommerce/action-scheduler/classes/ActionScheduler_QueueRunner.php(12): ActionScheduler_QueueRunner->__construct()
#2 /htdocs/wp-content/plugins/mailpoet/vendor/woocommerce/action-scheduler/classes/abstracts/ActionScheduler.php(25): ActionScheduler_QueueRunner::instance()
#3 /htdocs/wp-content/plugins/mailpoet/vendor/woocommerce/action-scheduler/classes/abstracts/ActionScheduler.php(103): ActionScheduler::runner()
#4 /htdocs/wp-content/plugins/mailpoet/vendor/woocommerce/action-scheduler/action-scheduler.php(21): ActionScheduler::init('/htdocs/wp-cont...')
#5 /htdocs/wp-content/plugins/all-in-one-seo-pack/vendor/woocommerce/action-scheduler/classes/ActionScheduler_Versions.php(59): action_scheduler_initialize_3_dot_8_dot_0()
#6 /htdocs/wp-includes/class-wp-hook.php(322): ActionScheduler_Versions::initialize_latest_version()
#7 /htdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#8 /htdocs/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#9 /htdocs/wp-settings.php(559): do_action('plugins_loaded')
#10 /htdocs/wp-config.php(85): require_once('/htdocs/wp-sett...')
#11 /htdocs/wp-load.php(50): require_once('/htdocs/wp-conf...')
#12 /htdocs/wp-blog-header.php(13): require_once('/htdocs/wp-load...')
#13 /htdocs/index.php(17): require('/htdocs/wp-blog...')
#14 {main}
thrown in /htdocs/wp-content/plugins/mailpoet/vendor/woocommerce/action-scheduler/classes/abstracts/ActionScheduler_Abstract_QueueRunner.php on line 12