[TYPO3-project-formidable] Formidable::Mayday on "Form inside a renderlet:LISTER" example

[Kontaxis Panagiotis]

Hi formidable users and developers,

I'm interested in this example 
http://formidable.typo3.ug/typo3-form-news/news/0026-forms-inside-a-renderlet-lister/back/2.html

(multiedit of records in a datagrid).

I follow the instructions and I copied-pasted the code from 
code-snippset but unfortunately when I clicked the button save or save 
all I got

Formidable::Mayday
: callback method _editPage of the Object $this (tx_ameosformidable_pi2) 
doesn't exist

I 'm using formidable version 1.0.183.

Thanks in advance for your help :-)

Panagiotis