Controller not found

Cannot load controller: "offertanfrage"
(File not found: /home/tlsexpre/public_html/site/../site/controllers/offertanfrage.ctl.php) Datas:
object(stdClass)#2 (7) {
  ["app"]=>
  string(4) "site"
  ["script"]=>
  string(15) "/offertanfrage/"
  ["junk"]=>
  string(0) ""
  ["ctl"]=>
  string(13) "offertanfrage"
  ["method"]=>
  string(5) "index"
  ["id"]=>
  NULL
  ["param"]=>
  array(0) {
  }
}