Error when testing web service

Hello,

I published a web service in the Service Registry, and now I am attempting to test it out in the Web Services Navigator. Unfortunately when I click on the web service from the search results I get the following error:

while trying to invoke the method com.sap.esi.uddi.sr.api.ws.PhysicalSystemKeyType.getLogicalKey() of an object returned from com.sap.esi.uddi.sr.api.ws.ServiceDefinitionType.getPhysicalSystemKey()

Has anyone seen this before?