Seeing this error while setting ad group name.
<?xml version="1.0" encoding="utf-8"?>
<env:Header>
<userAgent> *** (AwApi-Ruby/0.11.1, Common-Ruby/0.9.5, Savon/1.2.0, jruby/1.9.3, HTTPI/1.1.1, net_http)</userAgent>
<developerToken>***</developerToken>
<clientCustomerId>***</clientCustomerId>
</wsdl:RequestHeader>
</env:Header>
<env:Body>
<operations>
<operator>SET</operator>
<operand>
<id>17919913827</id>
<name>Supplies Outlet - Discount Code</name>
</operand>
</operations>
</mutate>
</env:Body>
</env:Envelope>
<soap:Body>
<soap:Fault>
<faultcode>soap:Server</faultcode>
<faultstring>InternalApiError.UNEXPECTED_INTERNAL_API_ERROR @
com.google.ads.api.services.common.error.InternalApiError.<init>(InternalApiErro</faultstring>
<detail>
<message>InternalApiError.UNEXPECTED_INTERNAL_API_ERROR @
com.google.ads.api.services.common.error.InternalApiError.<init>(InternalApiErro</message>
<ApplicationException.Type>ApiException</ApplicationException.Type>
xsi:type="InternalApiError">
<fieldPath></fieldPath>
<trigger></trigger>
<errorString>InternalApiError.UNEXPECTED_INTERNAL_API_ERROR</errorString>
<ApiError.Type>InternalApiError</ApiError.Type>
<reason>UNEXPECTED_INTERNAL_API_ERROR</reason>
</errors>
</ApiExceptionFault>
</detail>
</soap:Fault>
</soap:Body>
</soap:Envelope>