Fatal Error comes and goes

PHP Fatal error: Uncaught exception ‘Ai1ec_Event_Not_Found’ with message ‘Post with ID ‘538’ could not be retrieved from the database.’ in G:\Insite\insite\wp-content\plugins\all-in-one-event-calendar\app\model\class-ai1ec-event.php:377 Stack trace:

#0 G:\Insite\insite\wp-content\plugins\all-in-one-event-calendar\app\controller\class-ai1ec-events-controller.php(71): Ai1ec_Event->__construct(‘538’)

#1 [internal function]: Ai1ec_Events_Controller->delete_post(‘538’)

#2 G:\Insite\insite\wp-includes\plugin.php(403): call_user_func_array(Array, Array)

#3 G:\Insite\insite\wp-includes\post.php(2083): do_action(‘delete_post’, ‘538’)

#4 G:\Insite\insite\wp-includes\post.php(5218): wp_delete_post(‘538’, true)
#5 [internal function]: wp_delete_auto_drafts()

#6 G:\Insite\insite\wp-includes\plugin.php(484): call_user_func_array(‘wp_delete_auto_…’, Array)

#7 G:\Insite\insite\wp-cron.php(92): do_action_ref_array(‘wp_scheduled_au…’, Array)

#8 G:\Insite\insite\wp-includes\cron.php(240): include_once(‘G:\Insite\insit…’)

#9 G:\Insite\insi in G:\Insite\insite\wp-content\plugins\all-in-one-event-calendar\app\model\class-ai1ec-event.php on line 377

Comes and goes when I visit the page after a period of time. Not sure what it means. I’m working within an internal sever but I don’t think that makes a difference, any help appreciated.

https://www.ads-software.com/extend/plugins/all-in-one-event-calendar/