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 ('8e75bc1f761b80d2d14c5ba5265a986f', -1, 1406813417, 1406813417, 'b849552d', -1, 0)

Line : 158
File : sessions.php