Comment 1 for bug 919364

The Yahoo Maps API was shut down on September 13, 2011: http://developer.yahoo.com/blogs/ydn/posts/2011/06/yahoo-maps-apis-service-closure-announcement-new-maps-offerings-coming-soon/

This may be fixable by updating to the newer Yahoo Placefinder API http://developer.yahoo.com/geo/placefinder/guide/index.html (the api key works with the examples, and the result format seems similar), although where the maps api was rate limited to 5000 queries per IP per day, the Placefinder API seems to be limited to 50000 queries per application per day, so that may be an issue.