Authorisation problem

I've been trying to get this class to work on a Subversion server that requires authorization. I've already added the SASL class (http client requires it), but tough luck. This is my code:

$svn->setRepository("http://xxxxxxxx/");
$svn->setAuth("xxxx","xxxx");

The given information is definately correct, but the http client returns following error:
authentication error: the requested credential user is not defined

The SVN client itself returns error 3.

Thanks in advance!
Kind regards,
Mathew

I've already found the problem. The SVN class doesn't pass the username and password to the HTTP client class. I altered the setAuth function :

function setAuth($user,$pass) {
$this->user = $user;
$this->pass = $pass;
$this->_http->user = $user;
$this->_http->password = $pass;
}

That did the trick ...