phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpbb/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('3f903f1b5f0dc31cf57bb914d21247ff', -1, 1406109060, 1406109060, '36c4c3cf', -1, 0, 0)

Line : 187
File : sessions.php