Nullability of type of parameter 'vm' doesn't match overridden member (possibly because of nullability attributes).

Nullability of type of parameter 'vm' doesn't match overridden member (possibly because of nullability attributes).

Nullability of type of parameter 'vm' doesn't match overridden member (possibly because of nullability attributes).

Nullability of type of parameter 'vm' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'object StaticResourceConverter.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 'parameter' of 'object StaticResourceConverter.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 StaticResourceConverter.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 StaticResourceConverter.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).

Cannot convert null literal to non-nullable reference type.