"Run-time Error '1004', Method ' Range' Of Object '_Global' Failed"

I keep getting this "Run-time error '1004', Method ' Range' of object '_Global' failed" Here is the code that has the problem:

Option Explicit
Dim i As Long
Dim j As Long
Dim lDup As Long
Dim lRow As Long
Dim NoDupes As Collection
Dim rRng As Range
Dim Rng1 As Range
Dim Rng2 As Range
Dim Rng3 As Range
Dim Swap1 As Variant
Dim Swap2 As Variant
Dim wks As Worksheet

Private Sub UserForm_Initialize()
Call DefaultSet
For lDup = 1 To 3
Call NonDuplicatesList(lDup)
Next lDup
End Sub.....................

It does not even loop once though the original UserForm_Initialize For/Next loop.