Some progress but still not working.

org.opennms.core.xml.MarshallingResourceFailureException: Failed to
marshal/unmarshal XML file while marshalling PollerConfiguration:
javax.xml.bind.MarshalException
 - with linked exception:
[javax.xml.transform.TransformerException:
org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching
wildcard is strict, but no declaration can be found for element
'config'.]; nested exception is javax.xml.bind.MarshalException
 - with linked exception: