Code läuft nicht bei "Mappe freigeben"

Sub compareRanges()
Dim objWsA As Worksheet, objWsB As Worksheet
Dim rngA As Range, rngB As Range
Dim strA As String, strB As String, strSheet As String
Dim lngRow As Long, lngIndex As Long
Dim varRes As Variant
Application.ScreenUpdating = False
Sheets("Daten").Select
Columns("I:I").Select
Selection.ClearContents
Do
strSheet = "Daten"
If strSheet = "" Then Exit Sub
If SheetExist(strSheet) Then Exit Do
Loop
Set objWsA = Sheets(strSheet)
Do
strSheet = "Daten"
If strSheet = "" Then Exit Sub
If SheetExist(strSheet) Then Exit Do
Loop
Set objWsB = Sheets(strSheet)
Set rngA = objWsA.Range("C2:E" & Application.Max(objWsA.Cells(Rows.Count, 5).End(xlUp).Row,  _
2))
Set rngB = objWsB.Range("C2:E" & Application.Max(objWsB.Cells(Rows.Count, 5).End(xlUp).Row,  _
2))
For lngIndex = 1 To rngB.Columns.Count
strB = strB + rngB.Parent.Name & "!" & rngB.Columns(lngIndex).Address & "&"
Next
strB = Left(strB, Len(strB) - 1)
For lngRow = 1 To rngA.Rows.Count
strA = ""
For lngIndex = 1 To rngA.Columns.Count
strA = strA + rngA.Parent.Name & "!" & rngA.Cells(lngRow, lngIndex).Address & "&"
Next
strA = Left(strA, Len(strA) - 1)
If objWsA Is objWsB Then
varRes = Evaluate("SUM(N(" & strB & "=" & strA & "))")
If varRes >= 2 Then
varRes = Evaluate("MATCH(" & strA & "," & strB & ",0)")
Else
varRes = ""
End If
Else
varRes = Evaluate("MATCH(" & strA & "," & strB & ",0)")
End If
If IsNumeric(varRes) Then
rngA.Parent.Hyperlinks.Add _
Anchor:=rngA.Cells(lngRow, rngA.Columns.Count).Offset(0, 4), _
Address:="", _
SubAddress:=rngB.Parent.Name & "!" & rngB.Rows(varRes).Address, _
TextToDisplay:="Datensatz doppelt!"
End If
Next
Set objWsA = Nothing
Set objWsB = Nothing
Set rngA = Nothing
Set rngB = Nothing
Range("A1").Select
Application.ScreenUpdating = True
End Sub