NuSOAP - SOAP Toolkit for PHP

I am having problems with a WSDL provided by a new MS Dynamics NAV accounting system that is replacing our old #### system. I can manage to get it to give me the WSDL after going through an ntlm authentication, and it parses the WSDL debugging out what *looks* ok as a newbie to NuSoap anyway. At the end of it all however it is giving me a nusoap_client getOperations returned false... i.e. no operations defined in the WSDL document. I have also noticed that it reports undefined variable namespace in nusoap.php on lines 4923 and 4924 where it is setting the $this->ports[$this->currentPort]['bindingtype']=$namespace; Any ideas????