phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './messageboard/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 ('d9bea8acbdfa34ffa9fee294e4a9c311', -1, 1438045254, 1438045254, '3211577e', 1, 0, 0)

Line : 187
File : sessions.php