             
         }
         
-        self.headerView?.phaseNameLabel.text = "Error"
+        self.headerView.phaseNameLabel.text = "Error"
     }
     
     func modelDidUpdate(notification: NSNotification) -> Void {

        return PhasesDataSource(model: self.model)
    }()
    
    private lazy var headerView: LunarHeaderView? = {
        let nib = NSBundle.mainBundle().loadNibNamed(LunarHeaderView.nibName, owner: self, options: nil)
        guard let headerView = nib.first as? LunarHeaderView else {
            fatalError("Could not load LunarHeaderView from nib")

        
        switch result {
        case .Success(let moon):
            self.headerView.viewModel = LunarViewModel(moon: moon)
        case .Failure:
            print("error updating view model, no data")
        }
