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 ('31e055e5e6f01e4fa393a9331c493dec', -1, 1422304059, 1422304059, '369fda97', -1, 0)

Line : 158
File : sessions.php