ERROR #5002: Cache error in Ensemble Soap Service

I am getting an ERROR #5002 in a soap service defined in ensemble. Odd thing is that I allready have a functioning business service running as a soap service, but we needed another, but that one returns an error:

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:s="http://www.w3.org/2001/XMLSchema">
   <SOAP-ENV:Body>
      <SOAP-ENV:Fault>
         <faultcode>SOAP-ENV:Server</faultcode>
         <faultstring>Server Application Error</faultstring>
         <detail>
            <error xmlns="http://tempuri.org">
               <text>ERROR #5002: Cache error: &lt;UNDEFINED>zTestOperation+1^Test.WebService.1 *sc</text>
            </error>
         </detail>
      </SOAP-ENV:Fault>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

This is the class I defined and added to my ensemble production:

Class Test.WebService Extends EnsLib.SOAP.Service
{

Parameter ADAPTER;

Parameter SERVICENAME = "TestWebService";

Parameter LOCATION = "http://tst-intersystems.mydomain.com:57772/webservices";

Parameter NAMESPACE = "http://tempuri.org";

Method TestOperation(data As %String) [ WebMethod ]
{
    if $$$ISERR(sc) do ..ReturnMethodStatusFault(sc)
}

}

Where should I look to resolve this?

I am running ensemble 2016.2