EVB code for LUHN Algorithm validation

We are using embedded visual basic to check credit card numbers as they are entered into a text box (called 'edtaccount') on a PPC handheld.  The following code works perfectly if I run it in Visual Basic but when I try to compile in EVB it gives me an error on the following lines:

ReDim varArrNo(1 To intLength)
ReDim intArrProd(1 To intLength)
 
I've attached the code below and am not quite sure why this would compile and work in VB6 but not EVB?  Thanks for the help!

' nf :: Luhn Algorith (Mod 10) :: validate credit card
    ' ***************************
    Dim txtInput As String, txtOutput As String
    Dim intLength As Integer, intL1 As Integer, intDigit As Integer, intTmp As Integer
    Dim varArrNo() As Variant, intArrProd() As Integer, intSum As Integer
    Dim lngEnum As Long
    Dim intModulus As Integer
    Dim strRes As String
    
    txtInput = Trim(edtAccount.Text)
    intLength = Len(txtInput)
    
    If intLength = 0 Then
        Exit Sub
    End If
    
    Dim varArrNo(1 To intLength) As Variant
    Dim intArrProd(1 To intLength) As Integer
    
    intModulus = 10
    intDigit = 2
    
    If Not IsNumeric(Right(txtInput, 1)) Then
        MsgBox "Only numeric chars are allowed in Modulus 10", vbInformation, ""
        Exit Sub
    End If
    
    For intL1 = intLength To 1 Step -1
        If intDigit = 1 Then
            intDigit = 2
        ElseIf intDigit = 2 Then
            intDigit = 1
        End If
        varArrNo(intL1) = Val(Mid(txtInput, intL1, 1))
        intArrProd(intL1) = intDigit
        intTmp = intDigit * Val(Mid(txtInput, intL1, 1))
        If intTmp < 10 Then
            intSum = intSum + intTmp
        Else
            intSum = intSum + Val(Left(intTmp, 1))
            intSum = intSum + Val(Right(intTmp, 1))
        End If
    Next
    
    intDigit = intSum Mod 10
    
    If intDigit = 0 Then
        strRes = "Verified"
    Else
        strRes = "not Verified"
    End If
    
    MsgBox strRes
    ' ***************************

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