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Suddenly this happened:
I do not use Woocommerce plugin or theme.
WordPress version 5.4.2
Current plugin: WP Mail SMTP (version 2.2.1)
PHP version 7.2.32
An error of type E_ERROR was caused in line 44 of the file /home/yyy/public_html/xxx/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/migration/ActionScheduler_DBStoreMigrator.php. Error message: Uncaught RuntimeException: Error saving action: Error saving action: Table ‘wp_ajmn_actionscheduler_actions’ is read only in /home/yyy/public_html/xxx/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/migration/ActionScheduler_DBStoreMigrator.php:44
Stack trace:
#0 /home/yyy/public_html/xxx/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/data-stores/ActionScheduler_HybridStore.php(242): ActionScheduler_DBStoreMigrator->save_action(Object(ActionScheduler_Action), NULL)
#1 /home/yyy/public_html/xxx/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/ActionScheduler_ActionFactory.php(177): ActionScheduler_HybridStore->save_action(Object(ActionScheduler_Action))
#2 /home/yyy/public_html/xxx/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/ActionScheduler_ActionFactory.php(84): ActionScheduler_ActionFactory->store(Object(ActionScheduler_Action)
Tables use InnoDB and check shows OK. Any ideas what could cause this?