phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './phpbb_1/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 ('5c97c47f22456c5a9017bf72f37fd9c0', -1, 1429998201, 1429998201, '36a38d45', 5, 0)

Line : 158
File : /forum/includes/sessions.php