### __init__() takes exactly 5 arguments (4 given) error in contour plot

I am trying to make a contour plot of a complex valued function. Let say it is g(z).

I have imported the complex root and ContourPlot command by doing following:

```
from sage.rings.polynomial.complex_roots import complex_roots
from sage.plot.contour_plot import ContourPlot
```

I have even successfully plot the 3d-Plot, but I encountered an error stating:

```
__init__() takes exactly 5 arguments (4 given)
```

My command is:

```
C=ContourPlot(lambda x,y:float(green(x+y*I)),(-5,5),(-5,5))
```

It seems that I did not miss the fifth argument, I tried to add in some commands, such as plot_points, but then Sage said it did not expect these commands..

What did I miss? Thank you!!