I think there are a few mistakes such as:
 
getMenuItemsWithChilds()
	error_log says Blesta doesn't know such a function. This line: $menu_items = $this->CmsPages->getMenuItemsWithChilds();
 
	And we added menu items manually by changing body so why did we need to load menu items from cms I dont understand.
 
	Edit: OK. I see why we trying to fetch menu items but still the method called 'getMenuItemsWithChilds' is unknown. So it won't work anyway.