ConversionService RequestError.UNKNOWN

[xuantoi . ads . mtest]

Hi,

Iam getting RequestError.UNKNOWN when try to create conversion :

here is soap: 
<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/cm/v201809"; 
soapenv:mustUnderstand="0">
            <ns1:clientCustomerId>xxxxxxxxx</ns1:clientCustomerId>
            <ns1:developerToken>REDACTED</ns1:developerToken>
            <ns1:userAgent>Knorex-adwords (AwApi-Java, AdWords-Axis/4.1.0, 
Common-Java/4.1.0, Axis/1.4, Java/1.8.0_171, maven)</ns1:userAgent>
            <ns1:validateOnly>true</ns1:validateOnly>
            <ns1:partialFailure>false</ns1:partialFailure>
        </ns1:RequestHeader>
    </soapenv:Header>
    <soapenv:Body>
        <mutate xmlns="https://adwords.google.com/api/adwords/cm/v201809";>
            <operations>
                <operator>ADD</operator>
                <operand 
xmlns:ns2="https://adwords.google.com/api/adwords/cm/v201809"; 
xsi:type="ns2:AdWordsConversionTracker">
                    <ns2:name>Alamo Toyota - General Conversion</ns2:name>
                    <ns2:status>ENABLED</ns2:status>
                    <ns2:category>DEFAULT</ns2:category>
                    
<ns2:conversionTypeOwnerCustomerId>xxxxxxxx</ns2:conversionTypeOwnerCustomerId>
                    
<ns2:viewthroughLookbackWindow>30</ns2:viewthroughLookbackWindow>
                    <ns2:ctcLookbackWindow>30</ns2:ctcLookbackWindow>
                    <ns2:defaultRevenueValue>1.0</ns2:defaultRevenueValue>
                    
<ns2:defaultRevenueCurrencyCode>USD</ns2:defaultRevenueCurrencyCode>
                    
<ns2:alwaysUseDefaultRevenueValue>true</ns2:alwaysUseDefaultRevenueValue>
                    
<ns2:ConversionTracker.Type>AdWordsConversionTracker</ns2:ConversionTracker.Type>
                </operand>
            </operations>
        </mutate>
    </soapenv:Body>
</soapenv:Envelope>

2019-04-01 21:19:05.782  INFO 1952 --- [  XNIO-2 task-1] 
c.g.a.a.a.l.c.A.soapXmlLogger            : SOAP response:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
    <soap:Header>
        <ResponseHeader 
xmlns="https://adwords.google.com/api/adwords/cm/v201809";>
            <requestId>00058578b3eefccd0a627e0c430494a6</requestId>
            <serviceName>ConversionTrackerService</serviceName>
            <methodName>mutate</methodName>
            <operations>0</operations>
            <responseTime>148</responseTime>
        </ResponseHeader>
    </soap:Header>
    <soap:Body>
        <soap:Fault>
            <faultcode>soap:Client</faultcode>
            <faultstring>[RequestError.UNKNOWN @ 
operations[0]]</faultstring>
            <detail>
                <ApiExceptionFault 
xmlns="https://adwords.google.com/api/adwords/cm/v201809";>
                    <message>[RequestError.UNKNOWN @ 
operations[0]]</message>
                    
<ApplicationException.Type>ApiException</ApplicationException.Type>
                    <errors 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="RequestError">
                        <fieldPath>operations[0]</fieldPath>
                        <fieldPathElements>
                            <field>operations</field>
                            <index>0</index>
                        </fieldPathElements>
                        <trigger/>
                        <errorString>RequestError.UNKNOWN</errorString>
                        <ApiError.Type>RequestError</ApiError.Type>
                        <reason>UNKNOWN</reason>
                    </errors>
                </ApiExceptionFault>
            </detail>
        </soap:Fault>
    </soap:Body>
</soap:Envelope>

Can anyone help?

Thank you.

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