The object for day and night is still in the asset, just not placed in the example level since it can make it hard to see how everything else works.
The issue in the screenshot I do not know what is happening. Are you setting up a camera for the project or is it still just the default a blank project has? It might be that the way the default camera is setup things don't work correctly. Try setting up a camera through code and assign it to a view like view[0].