thirdsigma

I am having exactly the same problem.
I downloaded all in one calendar on Sunday
My theme is SurfLifeSaving 1.0 by imPowersites

error message=
Fatal error: Uncaught exception ‘Ai1ec_Event_Not_Found’ with message ‘Event with ID ‘388’ could not be retrieved from the database.’ in /home/kirrasur/public_html/wp-content/plugins/all-in-one-event-calendar/app/model/class-ai1ec-event.php:307 Stack trace: #0 /home/kirrasur/public_html/wp-content/plugins/all-in-one-event-calendar/app/helper/class-ai1ec-app-helper.php(428): Ai1ec_Event->__construct(388) #1 [internal function]: Ai1ec_App_Helper->custom_columns(‘ai1ec_event_dat…’, 388) #2 /home/kirrasur/public_html/wp-includes/plugin.php(405): call_user_func_array(Array, Array) #3 /home/kirrasur/public_html/wp-admin/includes/class-wp-posts-list-table.php(674): do_action(‘manage_posts_cu…’, ‘ai1ec_event_dat…’, 388) #4 /home/kirrasur/public_html/wp-admin/includes/class-wp-posts-list-table.php(334): WP_Posts_List_Table->single_row(Object(stdClass)) #5 /home/kirrasur/public_html/wp-admin/includes/class-wp-posts-list-table.php(318): WP_Posts_List_Table->_display_rows(Array) #6 /home/kirrasur/public_html/wp-admin/includes/cl in /home/kirrasur/public_html/wp-content/plugins/all-in-one-event-calendar/app/model/class-ai1ec-event.php on line 307

is there a glitch with your software?