phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1194 Table '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 ('81740474f710a9e7218ae462ba2533eb', -1, 1398262890, 1398262890, '36ccd7d1', -1, 0, 0)

Line : 172
File : sessions.php