Hello,

This example comes from the Web 2.0 Applications with PHP book,
I tried this and had the same problem,
the solution is simple,
just add:

$controller->setParam('noViewRenderer' , true);

after the ::getInstance();

and it works.
Don't ask me why,
I'm pretty new to this,
but the errors are gone,
at least in my case.

Hope it works for you.