Next Record VBA Code Produces Error

On the attached, the cmdbNextRecord Sub produces and error and I am not sure why.   Thank you for your assistance.
Asset-Register---8-14-15.xlsm
mcarsonsrAsked:
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GrahamSkanRetiredCommented:
You have declared rData as a Range type, but it is uninstantiated -  i.e. you haven't set it to any particular range.

Option Explicit
Dim ws As Worksheet
Dim rData As Range
Dim lRw As Long

Private Sub cmdbNextRecord_Click()
 If lRw = rData.Rows.Count - 1 Then
        MsgBox "You have selected the last record", vbCritical, "Cancel"
        Exit Sub
    Else: lRw = lRw + 1
        LoadBoxes
    End If
End Sub

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GrahamSkanRetiredCommented:
Neither of us has listed the error which is:

Run-time error '91':
Object variable or With block not set
Roy CoxGroup Finance ManagerCommented:
See the Initialize event of the UserForm

I provided you with the code to use to navigate records in your earlier post

Previous post
Asset-Register---8-14-15.xlsm
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mcarsonsrAuthor Commented:
Hi,

Thank you.  I have tried to define the range, but I still receive the run time error shown in the attached screen print.  I am very new to VBA.  Please advise and thank you.  The Excel workbook is attached.

Thank you!
Asset-Register---8-14-15.xlsm
CodeError.docx
GrahamSkanRetiredCommented:
You have added a procedure to define the values of the lRw Long variable and the rData Range:
Private Sub setinitialrange()
Set rData = ActiveSheet.Range("A4").CurrentRegion
lRw = rData.Cells(rData.Rows.Count).End(xlUp).Row
End Sub

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But there is no code to call the procedure.
Try calling it at the end of the form initialise procedure:
...
'        .cboClass.Value = rdata.Cells(lRw, 8).Value
'        .txtCustodian.Value = rdata.Cells(lRow, 9).Value
'        .txtYears.Value = rdata.Cells(lRw, 10).Value
'        .cboProtect.Value = rdata.Cells(lRw, 11).Value
'    End With

setinitialrange 
End Sub

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mcarsonsrAuthor Commented:
Thank you.  That helped!
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