SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Invalid SQL: SELECT postid FROM bb42_posts WHERE threadid = '2644' AND visible=1 ORDER BY posttime ASC LIMIT 0,25
mysql error: Out of resources when opening file './fh_netha/bb42_posts.MYD' (Errcode: 24)
mysql error number: 23
Date: 27.10.2020 @ 05:14
Script: /thread.php?threadid=2644
Referer: