phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './exponenta_forum/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 ('17266e41177d6cf2ef837122afb37b1e', -1, 1508495248, 1508495248, '36a6e8f3', -1, 0, 0)

Line : 190
File : sessions.php