Cannot query the database.

select distinct a.* from appt_dates a where a.accountid = '0' and a.ymd >= '20210228' and a.ymd <= '20210403' and a.status ='enabled' order by a.ymd asc

Error:
Table 'stanford.appt_dates' doesn't exist
Trace: (database.class.php:113)
(data.class.php:119)
(main.class.php:173)
(main.class.php:227)
(default.class.php:62)
(default.class.php:34)
(default.class.php:273)
(main.class.php:403)
(manager.class.php:23)
(document.class.php:196)
(document.class.php:129)
(index.php:12)