Error UNKNOWN at CustomerService->get()

[fischi]

Hi there,

I receive a strange error (code UNKNOWN) when trying to do a simple 
get-request to read the CustomerService of an Authenticated User.
The logs show the following error (also the request ID):

[Apr 14 2016 09:47:41.000000 - ERROR] effectiveUser= 
service=CustomerService method=get operators={} responseTime=167 
requestId=0005306ec9144d400ac22a2451037540 operations=0 units= 
server=adwords.google.com isFault=true faultMessage=[RequestError.UNKNOWN @ 
]

The SOAP Request and Response are pasted below.

Is there anything I can do to find out what is wrong with this particular 
request?

Thanks in advance!
Thomas

[Apr 14 2016 09:47:41.000000 - ERROR] POST 
/api/adwords/mcm/v201509/CustomerService HTTP/1.1
Host: adwords.google.com
Connection: Keep-Alive
User-Agent: PHP-SOAP/5.5.33-nmm1, gzip
Accept-Encoding: gzip, deflate
Content-Encoding: gzip
Content-Type: text/xml; charset=utf-8
SOAPAction: ""
Content-Length: 322
Authorization: Bearer 
ya29..xAIW0MSbaJHj8mzQA-U6JNnJRWfq_iy4v8vHIMXSSq25NoOuurQ21Sra9e5Ci8ltB0g

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope 
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:ns1="https://adwords.google.com/api/adwords/mcm/v201509"; 
xmlns:ns2="https://adwords.google.com/api/adwords/cm/v201509";>
  <SOAP-ENV:Header>
    <ns1:RequestHeader>
      <ns2:developerToken>XXXXX</ns2:developerToken>
      <ns2:userAgent>my.omp-tools.at:OMPTools:V0.1 (AwApi-PHP/7.0.0, 
Common-PHP/7.0.0, PHP/5.5.33-nmm1)</ns2:userAgent>
    </ns1:RequestHeader>
  </SOAP-ENV:Header>
  <SOAP-ENV:Body>
    <ns1:get/>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

HTTP/1.1 500 Internal Server Error
Content-Type: text/xml; charset=UTF-8
Content-Encoding: gzip
Date: Thu, 14 Apr 2016 09:47:41 GMT
Expires: Thu, 14 Apr 2016 09:47:41 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Server: GSE
Transfer-Encoding: chunked

<?xml version="1.0"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
  <soap:Header>
    <ResponseHeader 
xmlns:ns2="https://adwords.google.com/api/adwords/cm/v201509"; 
xmlns="https://adwords.google.com/api/adwords/mcm/v201509";>
      <ns2:requestId>0005306ec9144d400ac22a2451037540</ns2:requestId>
      <ns2:serviceName>CustomerService</ns2:serviceName>
      <ns2:methodName>get</ns2:methodName>
      <ns2:operations>0</ns2:operations>
      <ns2:responseTime>167</ns2:responseTime>
    </ResponseHeader>
  </soap:Header>
  <soap:Body>
    <soap:Fault>
      <faultcode>soap:Server</faultcode>
      <faultstring>[RequestError.UNKNOWN @ ]</faultstring>
      <detail>
        <ApiExceptionFault 
xmlns="https://adwords.google.com/api/adwords/mcm/v201509"; 
xmlns:ns2="https://adwords.google.com/api/adwords/cm/v201509";>
          <ns2:message>[RequestError.UNKNOWN @ ]</ns2:message>
          
<ns2:ApplicationException.Type>ApiException</ns2:ApplicationException.Type>
          <ns2:errors xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="ns2:RequestError">
            <ns2:fieldPath/>
            <ns2:trigger/>
            <ns2:errorString>RequestError.UNKNOWN</ns2:errorString>
            <ns2:ApiError.Type>RequestError</ns2:ApiError.Type>
            <ns2:reason>UNKNOWN</ns2:reason>
          </ns2:errors>
        </ApiExceptionFault>
      </detail>
    </soap:Fault>
  </soap:Body>
</soap:Envelope>

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