problem with using suds and sharepoint

I tried to add attachment to a sharepoint document library with this command:

result = client.service.AddAttachment("new doc","2","ab.ds","QUJDREVGR0hJSktMTU5PUA==")

but i got this error:

DEBUG:suds.client:sending to (http://portal:8080/rashno/_vti_bin/lists.asmx)

message:

<?xml version="1.0" encoding="UTF-8"?>

<SOAP-ENV:Envelope xmlns:ns0="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">

   <SOAP-ENV:Header/>

   <ns0:Body>

      <ns1:AddAttachment>

         <ns1:listName>new doc</ns1:listName>

         <ns1:listItemID>2</ns1:listItemID>

         <ns1:fileName>ab.ds</ns1:fileName>

         <ns1:attachment>QUJDREVGR0hJSktMTU5PUA==</ns1:attachment>

      </ns1:AddAttachment>

   </ns0:Body>

</SOAP-ENV:Envelope>

DEBUG:suds.client:headers = {'SOAPAction': u'"http://schemas.microsoft.com/sharepoint/soap/AddAttachment"', 'Content-Type': 'text/xml; charset=utf-8'}

DEBUG:suds.client:http succeeded:

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>Exception of type 'Microsoft.SharePoint.SoapServer.SoapServerException' was thrown.</faultstring><detail><errorstring xmlns="http://schemas.microsoft.com/sharepoint/soap/">Item does not exist. It may have been deleted by another user.</errorstring></detail></soap:Fault></soap:Body></soap:Envelope>

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/usr/lib/python2.6/site-packages/suds/client.py", line 542, in __call__

    return client.invoke(args, kwargs)

  File "/usr/lib/python2.6/site-packages/suds/client.py", line 602, in invoke

    result = self.send(soapenv)

  File "/usr/lib/python2.6/site-packages/suds/client.py", line 643, in send

    result = self.succeeded(binding, reply.message)

  File "/usr/lib/python2.6/site-packages/suds/client.py", line 678, in succeeded

    reply, result = binding.get_reply(self.method, reply)

  File "/usr/lib/python2.6/site-packages/suds/bindings/binding.py", line 151, in get_reply

    self.detect_fault(soapbody)

  File "/usr/lib/python2.6/site-packages/suds/bindings/binding.py", line 182, in detect_fault

    raise WebFault(p, fault)

suds.WebFault: Server raised fault: 'Exception of type 'Microsoft.SharePoint.SoapServer.SoapServerException' was thrown.'

please help me, tnx

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