I haven’t been able to view all Child Site in the Manage Site section for many months. I tried to repair the database using both wp-config.php and directly in phpMyAdmin. Without success. I tried to install the MainWP Dashboard on another WordPress, but there was the same result, and the message “DataTables warning: table id = mainwp-manage-sites-table - Invalid JSON response” was displayed. /datatables.net/tn/1 ".
I don’t know where the fault is.