phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './phpbb/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, session_admin) VALUES ('5b52ab01c4205b271dab881d8be7d504', -1, 1462389311, 1462389311, '36dd3abe', 1, 0, 0)

Line : 189
File : sessions.php