phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './koinonia_phpb1/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 ('277eac914f675eb02e273c92dc16db38', -1, 1464201857, 1464201857, '36c46842', 8, 0, 0)

Line : 187
File : sessions.php