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 ('152564ff09599afe0391e5b59c177e4f', -1, 1406776764, 1406776764, '3211584a', -1, 0, 0)

Line : 187
File : sessions.php