applescript - Applescript - フォルダが存在しない場合の作成

Question

この Applescript が機能しない理由を教えてください。ありがとう！

on open droppedItems
    tell application "Finder"
        set inputFolder to (container of first item of droppedItems) as Unicode text
        if (exists folder ("converted") of inputFolder) then
            set outputFolder to (inputFolder & "/converted/") as text
        else
            make new folder at inputFolder with properties {name:"converted"}
            set outputFolder to the result as text
        end if
    end tell
end