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 ('3428bfcc4076fa805649b012bc9b3cfa', -1, 1406689012, 1406689012, '36c4a2ee', -1, 0)

Line : 158
File : sessions.php