Database error in vBulletin 4.2.5:

Invalid SQL:

SELECT COUNT(*) AS count
FROM event AS event
INNER JOIN calendar AS calendar USING (calendarid)
WHERE event.visible = 0;

MySQL Error : Table 'vvvvv_vvv.calendar' doesn't exist
Error Number : 1146
Request Date : Saturday, November 17th 2018 @ 04:26:52 PM
Error Date : Saturday, November 17th 2018 @ 04:26:52 PM
Script : http://www.vvvvv.com/vb44/admincp/index.php?do=home
Referrer : http://www.vvvvvv.com/vb44/admincp/index.php?do=nav
IP Address : 156vvvvvv64
Username : admin
Classname : vB_Database_MySQLi
MySQL Version : 10.2.19-MariaDB
Server : 17sssss14
User Agent :