Zend Soap Client exception

If Zend_Soap_Client is giving you an "Invalid SOAP request" and you don't know why, try adding "$client->setSoapVersion(SOAP_1_1);".

The error I was getting:

[SoapFault]
Invalid SOAP request
stack trace

    * at ()
      in C:\xampplite\php\PEAR\Zend\Soap\Client.php line 1113 ...
            1110.                                                  $this->_preProcessArguments($arguments),
            1111.                                                  null, /* Options are already set to the SOAP client object */
            1112.                                                  (count($soapHeaders) > 0)? $soapHeaders : null,
            1113.                                                  $this->_soapOutputHeaders);
            1114.
            1115.         // Reset non-permanent input headers
            1116.         $this->_soapInputHeaders = array();

Thanks to Mark Steudel's comment at the zend soap client page