Water rendering... help!

[Jerry]

The program doesn't work for me. The first error is

viz.MainScene.visible(0,viz.WORLD)
TypeError: visible() takes exactly 2 arguments (3 given)

And when I change it to viz.MainScene.visible(0) it goes on but
then gives this error

rt = viz.addRenderTexture()
AttributeError: 'module' object has no attribute 'addRenderTexture'

Maybe that's something added in R3v3 which I'm not using?