<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_ij506oi9qp7vrup30ujodhgtkh, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static O getSingleFieldFromSingletonConcept(S progID, S conceptClass, S field) {
  RemoteDB db = new RemoteDB(progID);
  if (db.functional()) {
    L<RC> list = db.xlist(conceptClass);
    if (empty(list)) null;
    ret db.xget(first(list), field);
  }
  Concepts c = new Concepts(progID).safeLoad();
  ret cget(first(c.list(conceptClass)), field);
}