Missing argument 2 for views_node_feed_edit_form()

Thanks for the report, can you give a little more info about when this happens?

In the hook_menu()
$items['admin/settings/views_node_feed/edit']
is MENU_NORMAL_ITEM, and visible in the Navigation block, but the identifier does not passed for the form builder callback function (views_node_feed_edit_form() )
The identifier would be the 4th parts of the URL
'page arguments' => array('views_node_feed_edit_form', 4),
instead of
'page arguments' => array('views_node_feed_edit_form'),

The first argument of a form builder function must be the $form_state

I have the same problem.
When visiting " Site configuration › Views Node Feed" I get the following error message:

The page is shown, but all I see in the page is a "the requested page could not be found".

The problem has been already found, and reported here from Sweetchack, but it doesn't seem the code has been fixed, so far.