phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './db_morepc/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) VALUES ('120ac664a53afd7c43455255ec57da33', -1, 1511066484, 1511066484, '36c40283', 0, 0)

Line : 158
File : sessions.php