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Hello ALL 
i have this error 
how can i solve it 

MyBB SQL Error
MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1194 - Table 'mybb_sessions' is marked as crashed and should be repaired
Query:
SELECT s.sid, s.ip, s.uid, s.time, s.location, s.location1, u.username, u.invisible, u.usergroup, u.displaygroup FROM mybb_sessions s LEFT JOIN mybb_users u ON (s.uid=u.uid) WHERE s.time > '1505451413' ORDER BY u.username ASC, s.time DESC
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see replies here

thanks , solved

For speed, you may want to change the engine type for this table to "MEMORY" (assuming you have enough RAM)