phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './explicit/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 ('b92a6f308b0cb0c1a2773dfda527a200', -1, 1409683611, 1409683611, 'ccecfe7c', 5, 0, 0)

Line : 187
File : sessions.php