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 ('716fd7ba4af0c09f511979cd4d8ab819', -1, 1406557371, 1406557371, '36cdb317', 0, 0, 0)

Line : 189
File : sessions.php