Ambiguous Invocation on WhenActivated

I have a viewmodel where I’m trying to use WhenActivated to dispose:

    this.WhenActivated(disposables => 
    {
                       this.WhenAnyValue(x => x.Selected)
                        .WhereNotNull()
                        .ObserveOn(RxApp.MainThreadScheduler)
                        .Do(x => _logger.LogInformation($"selected {x?.Name}"))
                        .Subscribe(x => process(x))
                        .DisposeWith(disposables);
    });

And I get the error:

MyViewModel.cs(59, 22): [CS0121] The call is ambiguous between the following methods or properties: ‘System.Reactive.Disposables.DisposableMixins.DisposeWith(T, System.Reactive.Disposables.CompositeDisposable)’ and ‘Avalonia.Controls.Mixins.DisposableMixin.DisposeWith(T, System.Reactive.Disposables.CompositeDisposable)’

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>Solution :

The problem is with DisposeWith extension methods that the compiler can’t differentiate between. One is from the System.Reactive.Disposables.DisposableMixins class, and the other is from the Avalonia.Controls.Mixins.DisposableMixin class.

• Fully qualify the DisposeWith method with the namespace of the System.Reactive.Disposables class

or

• Add a using directive for the System.Reactive.Disposables namespace at the top of your file