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 ('7c21e4b8a75beeaec26b904c13c9ca91', -1, 1508338995, 1508338995, '36e02b60', -1, 0, 0)

Line : 190
File : sessions.php