PHP/ Soap issue

I am hoping there's a SOAP expert on the list as this is driving me mad and Google doesn't come up with much help ... I am trying to build a fairly simple web service in SOAP -- the client sends a string SKU to query a product catalogue database and receives product pricing data - I am using a WSDL file which validates OK ... anyway I keep getting this error:- SOAP-ERROR: Encoding: object has no 'name' property The PHP code is below:- $client = new SoapClient('http://example.com/catalogue.wsdl',array('trace' => 1,'exceptions' => 0)); $sku = '12345'; $client->getProduct($sku); I can post the wsdl file contents if necessary. Hoping someone can help point me in the right direction! TIA Rich