PlaceFinder returns blank result

Hi I am trying to look up intersections using placefinder.  I keep getting back a back a blank response.
Here is an example query: where.yahooapis.com/geocode?line1=EXTERIOR+STREET+at+PARK+AVENUE&line2=New+York+City+NY&flags=J&appid=XXXXXX

Here is the response:
<!-- wws01.geotech.bf1.yahoo.com uncompressed/chunked Tue Sep 13 07:24:57 PDT 2011 -->
Is there something I am doing wrong?