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 ('36956d4bc62d5ef010167e4ed0dbfba4', -1, 1508339041, 1508339041, '36e02b60', -1, 0, 0)

Line : 190
File : sessions.php