The following model throws an exception
```cs
[Example("Empty LineSeries with smoothing")]
public static PlotModel EmptyLineSeriesWithSmoothing_ThrowsException()
{
var plotModel1 = new PlotModel("Empty LineSeries with smoothing");
plotModel1.Series.Add(new LineSeries { Smooth = true });
return plotModel1;
}
```
```cs
[Example("Empty LineSeries with smoothing")]
public static PlotModel EmptyLineSeriesWithSmoothing_ThrowsException()
{
var plotModel1 = new PlotModel("Empty LineSeries with smoothing");
plotModel1.Series.Add(new LineSeries { Smooth = true });
return plotModel1;
}
```