     /// [ReactiveViewModel.](https://github.com/ReactiveCocoa/ReactiveViewModel)
     ///
     /// This property defaults to false.
-    public let active = ReactiveCocoa.MutableProperty(false)
+    public let active = MutableProperty(false)
     
     /// Observes the receiver's `active` property, and sends the receiver whenever it
     /// changes from false to true.

    /// Initializes a ViewModel.
    public init()
    {
        title = ReactiveCocoa.MutableProperty(nil)

        let errors: (Signal<Signal<ViewModelErrorType, NoError>, NoError>, Observer<Signal<ViewModelErrorType, NoError>, NoError>) = Signal.pipe()
        
        self.errors = errors.0.flatten(.Merge)

public class ViewModel: ViewModelType
{
    /// Used as general `title`
    public let title = MutableProperty<String?>(nil)
    
    /// Whether the view model is currently "active."
    ///
