Warning:  [mysql error 23] Out of resources when opening file './piwigo/piwigo_themes.MYD' (Errcode: 24)

SELECT
    ui.*,
    uc.*,
    t.name AS theme_name
  FROM piwigo_user_infos AS ui
    LEFT JOIN piwigo_user_cache AS uc ON ui.user_id = uc.user_id
    LEFT JOIN piwigo_themes AS t ON t.id = ui.theme
  WHERE ui.user_id = 2
; in /home/www/hyvatti.iki.fi/foto/include/dblayer/functions_mysqli.inc.php on line 830