Foursquare Venue Category url Icon - Access Denied

I have a Android application thats use FoursquareAPI.

When i put the venues on map some requests return Access Denied

Here a example:

https://ss1.4sqi.net/img/categories/education/administrativebuilding_32.png

<Error>
<Code>AccessDenied</Code>
<Message>Access Denied</Message>
<RequestId>A25C4A76CBE89768</RequestId>
<HostId>BQQK0z2iGYhmxjUJvlTz2vUWYO4wTF8lE7g6LuS1jHXNmwT88FwvfObPqyPzWOne</HostId>
</Error>