#9 getPublicList causes crash

[Anonymous]

Fa = f.getFavoritesInterface();
User u;

u = Pe.findByUsername("someuser");

Set<String> extras = new HashSet<String>();
String shortUrl = "URL_S";
extras.add(shortUrl);

PhotoList list = Fa.getPublicList(u.getId(), 0, 0, extras);

What am I doing that causes Android to drop the application because it behaves unexpectedly? Are there any example of how to get a user's public list?

Thank you