Exception in Storeboard

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WPF

This is my full Code

namespace WpfApplication71

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        Frame objframe;

      

        TransformGroup trGrp;

        TranslateTransform trTns;

        ScaleTransform trScl;



        public MainWindow()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, RoutedEventArgs e)

        {

            objframe = new Frame();

            objframe.Background = Brushes.Blue;

            trTns = new TranslateTransform();

            trScl = new ScaleTransform();

            trGrp = new TransformGroup();

            trGrp.Children.Add(trTns);

            trGrp.Children.Add(trScl);

            objframe.RenderTransform = trGrp; 

            objframe.Loaded += new RoutedEventHandler(objframe_Loaded);

            mygrid.Children.Add(objframe);



        }



        void objframe_Loaded(object sender, RoutedEventArgs e)

        {

            var sb1 = new Storyboard();



            var da1 = new DoubleAnimationUsingKeyFrames();

            da1.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0)), Value = 0 });

            da1.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(20)), Value = 1, KeySpline = new KeySpline(0, 0, 0.4, 0.969) });

            da1.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(25)), Value = 1, KeySpline = new KeySpline(0, 0, 0.4, 0.969) });

            Storyboard.SetTargetProperty(objframe, new PropertyPath("(UIElement.Opacity)"));

            Storyboard.SetTarget(da1, objframe);

            sb1.Children.Add(da1);



            var da3 = new DoubleAnimationUsingKeyFrames();

            da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0)), Value = 1 });

            da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 0.8, KeySpline = new KeySpline(0, 0, 0.4, 0.969) });

            da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 1 });

            da3.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(25)), Value = 1 });

            Storyboard.SetTargetProperty(da3, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)"));

            Storyboard.SetTarget(da3, objframe);

            sb1.Children.Add(da3);

            var da5 = new DoubleAnimationUsingKeyFrames();

            da5.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0)), Value = 1 });

            da5.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 0.8, KeySpline = new KeySpline(0, 0, 0.4, 0.969) });

            da5.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(15)), Value = 1 });

            da5.KeyFrames.Add(new SplineDoubleKeyFrame { KeyTime = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(25)), Value = 1 });

            Storyboard.SetTargetProperty(da5, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)"));

            Storyboard.SetTarget(da5, objframe);

            sb1.Children.Add(da5);

            sb1.Begin();

        }

    }

}

When i Click on the button Exception is occure

Must specify TargetProperty for 'System.Windows.Media.Animation.DoubleAnimationUsingKeyFrames'.

How can i solve this problem.