Facebook SDK keeps crashing android app

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http://stackoverflow.com – Okay so i'm trying to implement the Facebook SDK into my Android app. Problem is, when i use the code explained within the Facebook documentation, my app just crashes with no error messages. Heres the code im currently using (from the Facebook documentation): // start Facebook Login Session.openActiveSession(this, true, new Session.StatusCallback() { // callback when session changes state @Override public void call(Session session, SessionState state, Exception exception) { if (session.isOpened()) (HowTos)