No such node error on SceneGraphTutorial

Also - I'm certain that nobody else finds it confusing how they insist on using "Screen" and "Scene" all the time.  As they sound so similar it'd make more sense to keep straight with perhaps something like "Display" and "Scene" IMO.  I also don't really find much reference to a graph of any kind in Scenegraph - it's like Roku put a bunch of words in a hat and picked two and said, yup, let's call it scenegraph - second choice was XML-Layout-Realtime-Compile, or XLRC.... no rhyme or reason to anything.