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 ('88d948e7338857c21266f561e6bd8b9c', -1, 1406652479, 1406652479, '36e0d66d', -9, 0)

Line : 158
File : sessions.php