phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './muestras_foro/bb_sessions' is marked as crashed and last (automatic?) repair failed

INSERT INTO bb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6cdd2ddea55f8de15f6136ecb2501e90', -1, 1411337264, 1411337264, '36a1a6ab', -1, 0, 0)

Line : 187
File : sessions.php