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MVVM Toolkit error MVVMTK0044

Using [ObservableProperty] with (partial) properties requires a higher version of Roslyn (remove [ObservableProperty] or target a field instead, or upgrade to at least Visual Studio 2022 version 17.12 and the .NET 9 SDK).

The following sample generates MVVMTK0044 when using an older .NET SDK (eg. the .NET 8 SDK):

using CommunityToolkit.Mvvm.ComponentModel;

namespace MyApp;

public partial class SampleViewModel : ObservableObject
{
    [ObservableProperty]
    public partial string? Name { get; set; }
}

You should update your environment to Visual Studio 17.12 and the .NET 9 SDK.

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