MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
126 - Incorrect key file for table './forumMyBB/mybb_sessions.MYI'; try to repair it
Query:
REPLACE INTO mybb_sessions SET `uid`='0',`sid`='7baba512a2cb5f007ce7a4beca07175f',`time`='1711625372',`ip`='3.91.19.28',`location`='/calendar.php?action=addevent&calendar=1&day=1&month=2&year=2017',`useragent`='claudebot',`location1`='0',`location2`='0',`nopermission`='0'