CustomerServer getCustomers throws UNEXPECTED_INTERNAL_API_ERROR

[gyntema]

I've been consistently getting an UNEXPECTED_INTERNAL_API_ERROR when using 
the googleads-java-lib to make a request to the AdWords CustomerService. 
Any idea on what might be missing?


Service: CustomerService
Method: getCustomers
URL: https://adwords.google.com/api/adwords/mcm/v201708/CustomerService
Request ID: 00055abd3118b9800aa37bcc8202950e

SOAP request:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema"; xmlns:xsi=
"http://www.w3.org/2001/XMLSchema-instance";>
    <soapenv:Header>
        <ns1:RequestHeader xmlns:ns1=
"https://adwords.google.com/api/adwords/mcm/v201708"; soapenv:mustUnderstand=
"0">
            <ns2:developerToken xmlns:ns2=
"https://adwords.google.com/api/adwords/cm/v201708";>REDACTED
</ns2:developerToken>
            <ns3:userAgent xmlns:ns3=
"https://adwords.google.com/api/adwords/cm/v201708";>AdWords (AwApi-Java, 
AdWords-Axis/3.8.0, Common-Java/3.8.0, Axis/1.4, Java/1.8.0_91, maven)
</ns3:userAgent>
            <ns4:validateOnly xmlns:ns4=
"https://adwords.google.com/api/adwords/cm/v201708";>false</ns4:validateOnly>
            <ns5:partialFailure xmlns:ns5=
"https://adwords.google.com/api/adwords/cm/v201708";>false
</ns5:partialFailure>
        </ns1:RequestHeader>
    </soapenv:Header>
    <soapenv:Body>
        <getCustomers xmlns=
"https://adwords.google.com/api/adwords/mcm/v201708"/>
    </soapenv:Body>
</soapenv:Envelope>

SOAP response:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
    <soap:Header>
        <ns2:ResponseHeader xmlns=
"https://adwords.google.com/api/adwords/cm/v201708"; xmlns:ns2=
"https://adwords.google.com/api/adwords/mcm/v201708";>
            <requestId>00055abc34fcee000aa35acdcc0a5bfe</requestId>
            <serviceName>CustomerService</serviceName>
            <methodName>getCustomers</methodName>
            <operations>0</operations>
            <responseTime>157</responseTime>
        </ns2:ResponseHeader>
    </soap:Header>
    <soap:Body>
        <soap:Fault>
            <faultcode>soap:Server</faultcode>
            <faultstring>[InternalApiError.UNEXPECTED_INTERNAL_API_ERROR @ 
com.google.ads.api.services.common.error.InternalApiError.&lt;init&gt;(InternalApiErro]
</faultstring>
            <detail>
                <ns2:ApiExceptionFault xmlns=
"https://adwords.google.com/api/adwords/cm/v201708"; xmlns:ns2=
"https://adwords.google.com/api/adwords/mcm/v201708";>
                    <message>[InternalApiError.UNEXPECTED_INTERNAL_API_ERROR 
@ 
com.google.ads.api.services.common.error.InternalApiError.&lt;init&gt;(InternalApiErro]
</message>
                    <ApplicationException.Type>ApiException
</ApplicationException.Type>
                    <errors xmlns:xsi=
"http://www.w3.org/2001/XMLSchema-instance"; xsi:type="InternalApiError">
                        <fieldPath/>
                        <trigger/>
                        <errorString>
InternalApiError.UNEXPECTED_INTERNAL_API_ERROR</errorString>
                        <ApiError.Type>InternalApiError</ApiError.Type>
                        <reason>UNEXPECTED_INTERNAL_API_ERROR</reason>
                    </errors>
                </ns2:ApiExceptionFault>
            </detail>
        </soap:Fault>
    </soap:Body>
</soap:Envelope>

More request info:
com.google.api.ads.adwords.lib.client.AdWordsServiceClient.requestInfoLogger
: Request made: Service: CustomerService Method: getCustomers 
clientCustomerId: null URL: 
https://adwords.google.com/api/adwords/mcm/v201708/CustomerService 
Request ID: 00055abd3118b9800aa37bcc8202950e ResponseTime(ms): 167 
OperationsCount: 0 IsFault: true FaultMessage: 
ApiException{applicationExceptionType=ApiException, 
errors=[InternalApiError{apiErrorType=InternalApiError, 
errorString=InternalApiError.UNEXPECTED_INTERNAL_API_ERROR, fieldPath=, 
reason=UNEXPECTED_INTERNAL_API_ERROR, trigger=}]}


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