undefined property 'respondAs' of RequestHandler

I try to make a custom error message and output it as a xml view.
I call in the controller cakeError() :

{{{
function beforeRender()
{
$this->cakeError('myError', $this->viewVars);
}
}}}

and in my app_error.php I created a myError() method

{{{
public function myError($params)
{
if (!isset($params['name'])) {
$params['name'] = $this->codes[$params['code']];
}
if (empty($params['request'])) {
$params['request'] = $this->controller->here;
}
if (empty($params['title'])) {
$params['title'] = $params['code'] . ' ' . $params['name'];
}
extract($params, EXTR_OVERWRITE);
$this->controller->set(array(
'code' => isset($code) ? $code : 404,
'request' => isset($request) ? $request : null,
'name' => isset($name) ? $name : null,
'title' => isset($title) ? $title : null,
'errcode' => isset($errcode) ? $errcode : 0,
'message' => isset($message) ? $message : null,
'invalidFields' => isset($invalidFields) ?
$invalidFields : null,
));
$this->controller->RequestHandler->renderAs($this->controller,
'xml');
// set header
header("HTTP/1.x $params[code] $params[name]");
$this->_outputMessage('myError');
}
}}}

Now I get this Notice:
Notice (8): Undefined property: Controller::$RequestHandler [APP/
app_error.php, line 88
Where line 88 is the line where I want the view to respondAs XML:
$this->controller->RequestHandler->renderAs($this->controller, 'xml');

But when I leave out the errocode var then everything is alright and
the view is generated as a valid xml message.

Does anybody knows how this is possible?
thnx!
- primeminister
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