VBA Error

I created this post so that I could include the following screen shot in a thread (link below) in the MS Office Forums:

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I want to have a macro where I can select a folder and then, for each MS Word document in each sub-folder, refresh the fields. Here's the forum thread: http://www.msofficeforums.com/word-vba/38290-update-fields-all-documents-folder.html

When I consulted the online Help for this error, I saw this:

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Might as well have been written in Klingon because I have no idea how to apply the words I read to my macro:

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'Part I
Option Explicit
Dim FSO As Object, oFolder As Object, StrFolds As String

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'Part II
Sub Main()
Application.ScreenUpdating = False
Dim TopLevelFolder As String, TheFolders As Variant, aFolder As Variant, i As Long
TopLevelFolder = GetFolder
StrFolds = vbCr & TopLevelFolder
If FSO Is Nothing Then
Set FSO = CreateObject("Scripting.FileSystemObject")
End If
'Get the sub-folder structure
Set TheFolders = FSO.GetFolder(TopLevelFolder).SubFolders
For Each aFolder In TheFolders
RecurseWriteFolderName (aFolder)
Next
'Process the documents in each folder
For i = 1 To UBound(Split(StrFolds, vbCr))
Call UpdateDocuments(CStr(Split(StrFolds, vbCr)(i)))
Next
Application.ScreenUpdating = True
End Sub

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'Part III
Sub RecurseWriteFolderName(aFolder)
Dim SubFolders As Variant, SubFolder As Variant
Set SubFolders = FSO.GetFolder(aFolder).SubFolders
StrFolds = StrFolds & vbCr & CStr(aFolder)
On Error Resume Next
For Each SubFolder In SubFolders
RecurseWriteFolderName (SubFolder)
Next
End Sub

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'Part IV
Sub UpdateDocuments(oFolder As String)
Dim strFolder As String, strFile As String, wdDoc As Document
StrInFolder = oFolder
If strFolder = "" Then Exit Sub
strFile = Dir(strFolder & "\*.docx", vbNormal)
While strFile <> ""
Set wdDoc = Documents.Open(FileName:=strFolder & "\" & strFile, AddToRecentFiles:=False, Visible:=False)
With wdDoc
Call RefreshFields(wdDoc)
.Close SaveChanges:=True
End With
strFile = Dir()
Wend
Set wdDoc = Nothing
End Sub

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'Part V
Sub RefreshFields(wdDoc As Document)
Dim oStory As Range, oTOC As TableOfContents, oTOF As TableOfFigures
With wdDoc
For Each oStory In .StoryRanges
oStory.Fields.Update
If oStory.StoryType <> wdMainTextStory Then
While Not (oStory.NextStoryRange Is Nothing)
Set oStory = oStory.NextStoryRange
oStory.Fields.Update
Wend
End If
Next oStory
For Each oTOC In .TablesOfContents
oTOC.Update
Next oTOC
For Each oTOF In .TablesOfFigures
oTOF.Update
Next oTOF
End With
End Sub

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'Part VI
Function GetFolder() As String
Dim oFolder As Object
GetFolder = ""
Set oFolder = CreateObject("Shell.Application").BrowseForFolder(0, "Choose a folder", 0)
If (Not oFolder Is Nothing) Then GetFolder = oFolder.Items.Item.Path
Set oFolder = Nothing
End Function

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