NuSoap: Error parsing payload, Reserved XML name.

[Stooshie]

I have written both the server and the client in the app and, although the web services work when a web service is called (the DB is updated successfully and the return values within the soap response are correct), The soap request traps an error in the server response:

"XML error parsing SOAP payload on line 7: Reserved XML Name"

The server response is as follows:

HTTP/1.1 200 OK
Date: Thu, 30 Jun 2011 14:34:03 GMT
Server: Apache/2.2.17 (Win32) mod_ssl/2.2.17 OpenSSL/0.9.8o PHP/5.3.4 mod_perl/2.0.4 Perl/v5.10.1
X-Powered-By: PHP/5.3.5
X-SOAP-Server: NuSOAP/0.7.3 (1.114)
Content-Length: 761
Connection: close
Content-Type: text/xml; charset=UTF-8
 
    
    
 
    
    
<?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope xmlns:SOAP-ENV=" ... "><SOAP-ENV:Body> ... </SOAP-ENV:Body></SOAP-ENV:Envelope>

The 7 lines of whitespace are part of the response.

I am positive it is the whitespace that is causing the error (as the request assumes the xml has started immediately after the header, then it hits the <?xml tag and thinks it is being used as part of the soap response).

What is causing this whitespace? Any ideas anyone?