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 ('4b74dd9deb9eb8d858720065a3cd0f86', -1, 1394267862, 1394267862, '36518b9f', -1, 0, 0)

Line : 187
File : sessions.php