phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './mediest_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 ('2a21b8787bf532d9e4aa7116812dcaaa', -1, 1397972722, 1397972722, '1715177e', 4, 0, 0)

Line : 187
File : sessions.php