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 ('5c241a1a7ea5faba883a92d0830acec1', -1, 1398300357, 1398300357, '36c694bf', -1, 0)

Line : 158
File : sessions.php