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 ('f10b888a28d3d2f50c882f97e731539a', -1, 1406160948, 1406160948, '365011e0', -9, 0)

Line : 158
File : sessions.php