Non-nullable property 'SelectedEntry' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Nullability of reference types in type of parameter 'parameter' of 'object TroubleShootingSeverityToBrushConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)' doesn't match implicitly implemented member 'object? IValueConverter.ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'object TroubleShootingSeverityToBrushConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)' doesn't match implicitly implemented member 'object? IValueConverter.ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'parameter' of 'object TroubleShootingSeverityToBrushConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)' doesn't match implicitly implemented member 'object? IValueConverter.Convert(object? value, Type targetType, object? parameter, CultureInfo culture)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'object TroubleShootingSeverityToBrushConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)' doesn't match implicitly implemented member 'object? IValueConverter.Convert(object? value, Type targetType, object? parameter, CultureInfo culture)' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in type of parameter 'data' of 'Control ViewLocator.Build(object data)' doesn't match implicitly implemented member 'Control? ITemplate<object?, Control?>.Build(object? param)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'data' of 'bool ViewLocator.Match(object data)' doesn't match implicitly implemented member 'bool IDataTemplate.Match(object? data)' (possibly because of nullability attributes).

Possible null reference argument for parameter 'destinationDirectoryName' in 'void ZipFileExtensions.ExtractToDirectory(ZipArchive source, string destinationDirectoryName)'.