SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.1.5): Invalid SQL: SELECT * FROM bb2_posts WHERE postid = '3496'
mysql error: Can't open file: './usr_web1_15/bb2_posts.frm' (errno: 24)
mysql error number: 1016
mysql version: 5.5.47-0+deb6u1-log
php version: 5.3.3-7+squeeze29
Date: 05.07.2020 @ 02:34
Script: /thread.php?postid=3496
Referer: