System.ArgumentException '{DependencyProperty.UnsetValue}' is not a valid value for the 'System.Windows.Controls.Image.Source' property on a Setter. Server stack trace: at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal)
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