phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './unitedheroes/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 ('f790bd2e80929777a2d4f8db5c3f835b', -1, 1500820419, 1500820419, '3651d22a', -1, 0, 0)

Line : 187
File : sessions.php