mac（而非windows）上excel vba中的文件对话框错误91

下面的子例程在Windows上正常工作，但在Mac上，我得到一个运行时错误91，对象变量或块变量未在excel for Mac上设置。我正在寻找一个解释，为什么，或者怎么办

代码：

systems:
Windows 10, Excel (don't remember the version, but should be very recent)
Mac OSX Catalina, Excel 16.42

Sub tests()
 
Dim folder As String
 
With Application.FileDialog(msoFileDialogFilePicker)
    .Show
    folder = .SelectedItems(1)
End With
 
Debug.Print folder
 
End Sub