I'm trying to make a request to the Google Places API, using the following url: <https://maps.googleapis.com/maps/api/place/search/xml?location=37.77264,-122.409915&radius=500&types=educational%20services&name=everest%20college%20san%20francisco&sensor=false&key=YourApiKey> 

This is the response I get:

```
<PlaceSearchResponse>
  <status>REQUEST_DENIED</status>
</PlaceSearchResponse>

```

Any idea what could be wrong with the above URL?