AppleScript does not run from Automator

I try to implement a folder action with Automator. So i use the module "folder action" and there defining the folder. The only action module in there is "Execute AppleScript" with this code inside:

on run {input, parameters}
    set fileName to name of (item 1 of input)
    display dialog fileName
end run

I simply want to know, if the file dropped into the folder will be transfered!

No dialog is showing up!

The workflow is connected to the folder, because when i insert an action module like "Delete file" it works!

Is there a permission problem?

I tried now the following (without Automator):

on adding folder items to this_folder after receiving these_items
        display dialog (item 1 of these_items) as text
  end adding folder items to

This works fine and shows me that the binding to my folder works and these_items will be passed as a text to the dialog!

But this does not work!?:

    on adding folder items to this_folder after receiving these_items
    tell application "Finder"
        set fileName to name of (item 1 of input)
        display dialog fileName
    end tell
end adding folder items to

Strange: I tried with Automator again:

on run {input, parameters}
    tell application "Finder"
        set fileName to name of (item 1 of input)
    end tell
    display dialog fileName
end run

and it WORKS!

What is the difference to the example directly with an AppleScript as above?

Ah, i made a mistake! it should be "these_items" not "input"! Both versions work! Thank you all!