Applescript Apple脚本错误查找程序出错：AppleeEvent处理程序失败

这是我正在尝试制作的脚本 我正试图用if和else语句创建一个脚本，以查看我的桌面上是否存在Fido_数据，但由于某种原因，它只是得到了错误查找程序得到了一个错误：AppleEvent处理程序失败

tell application "Finder"
    if exists folder [homePath & "Desktop/Fido_Data"] then
        set FidoFolderExists to "yes"
    else
        display dialog homePath & "Desktop/"
        make new folder at [homePath & "Desktop/"] with properties {name:"Fido_Data"}
    end if
end tell

尝试：

---

在10.10.5中，我偶然发现finder文件存在错误的间歇性案例。我建议：

-- ------------------------------------------------------  
(*
  Philip Regan
  https://stackoverflow.com/questions/3469389/applescript-testing-for-file-existence
*)
on fileExists(theFile) -- (String) as Boolean
    tell application "System Events"
        if exists file theFile then
            return true
        else
            return false
        end if
    end tell
end fileExists

-- ------------------------------------------------------  
(*
  Philip Regan
  https://stackoverflow.com/questions/3469389/applescript-testing-for-file-existence
*)
on fileExists(theFile) -- (String) as Boolean
    tell application "System Events"
        if exists file theFile then
            return true
        else
            return false
        end if
    end tell
end fileExists