[TYPO3-mvc] initializeAction with getArguments triggers fatal error

[Tomita Militaru]

Hello,

I have the following code in initializeAction:
http://pastebin.com/PNg8wEmM

But I get the following error:
Fatal error: Call to a member function getArgumentNames() on a non-object

I read that the arguments are ready in initializeAction:
http://docs.typo3.org/typo3cms/ExtbaseFluidBook/b-ExtbaseReference/Index.html#id23 


Can someone help me, what am I doing wrong?

Thanks.