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 ('ad6df6ab2982d8d60facd0e91befaaac', -1, 1414169486, 1414169486, '36d3d4ae', 29, 0)

Line : 158
File : sessions.php