phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpBB/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('863ee81a5a3d77a58282e48f30de0ff9', -1, 1466845703, 1466845703, '36a220a1', 15, 0, 0)

Line : 187
File : sessions.php