plesk login page give the error

[niranjan_mr]

Unable to query: Can't find file: 'sessions.MYD' (errno: 2) 0: /usr/local/psa/admin/plib/common_func.php3:2 psaerror(string "Unable to query: Can't find file: 'sessions.MYD' (errno: 2)") 1: /usr/local/psa/admin/plib/class.Session.php:2 db_query(string "select * from sessions where sess_id="b1ea2c48d5fc67cd290107d6cab669af" and click_time >= NOW() - INTERVAL 1800 SECOND") 2: /usr/local/psa/admin/plib/class.Session.php:2 session->isexpired() 3: /usr/local/psa/admin/auto_prepend/auth.php3:2 session->init(string "")