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 ('7b7544c17b708898043e402b4a53cfd3', -1, 1422238807, 1422238807, '3690ec0c', -1, 0, 0)

Line : 187
File : sessions.php