phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './forum_members/phpbb_sessions' is marked as crashed and last (automatic?) repair failed

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('8487435c4fd65655bf33c86618cb80d7', -1, 1406380176, 1406380176, '3651b18c', 29, 0)

Line : 158
File : sessions.php