I get back: <ows:ExceptionReport version='1.1.0' language='en' xmlns:ows='http://www.opengis.net/ows'><ows:Exception exceptionCode='InvalidParameterValue'><ows:ExceptionText>The spatial operation is invalid (invalid name or namespace for distance element).</ows:ExceptionText></ows:Exception></ows:ExceptionReport>
Same request works on other WFS servers. I've tried different distance units, no go. What have I missed here?