VBA Excel "Object Required" error - vba

Question

My codes gives me a Object Required 424 error on this line:
lngRow = .Cells(.Rows.Count, 1).End(xlUp).Row
My full code:
Private Sub Worksheet_Change(ByVal Target As Range)
' If Target.Count > 1 Then Exit Sub
' If Target.Column > 2 Then Exit Sub
Application.EnableEvents = False
If Target.Column = 6 Then
If Target.Offset(0, 1).Value <> "" Then
MsgBox "You must only fill in one of the two columns"
Target.ClearContents
GoTo ExitSub
End If
End If
If Target.Column = 7 Then
If Target.Offset(0, -1).Value <> "" Then
MsgBox "You must only fill in one of the two columns"
Target.ClearContents
GoTo ExitSub
End If
End If
Dim arrData() As Variant
Dim i As Long
Dim lngRow As Long
Dim myNum As Variant
Dim ws As Worksheet
myNum = Target.Value
If Target.Column = 6 Then
With BogieInspectionPoints 'this is a sheet name
lngRow = .Cells(.Rows.Count, 1).End(xlUp).Row
arrData = .Range("a1:b" & lngRow)
End With
End If
If Target.Column = 7 Then
With WagonInspectionPoints 'this is a sheet name
lngRow = .Cells(.Rows.Count, 1).End(xlUp).Row
arrData = .Range("a1:b" & lngRow)
End With
End If
For i = 1 To lngRow
If myNum = arrData(i, 1) Then
Cells(Target.Row, 8).Value = arrData(i, 2)
Exit For
End If
Next
ExitSub:
Application.EnableEvents = True
End Sub

Answer 1

It looks like those sheet variables aren't set.
You will need to add this at the top.
Dim BogieInspectionPoints as Worksheet
Dim WagonInspectionPoints as Worksheet
Set BogieInspectionPoints = ActiveWorkbook.Sheets("BogieInspectionPoints")
Set WagonInspectionPoints = ActiveWorkbook.Sheets("WagonInspectionPoints")
I was assuming there was other code. When you add this line all the With statements should process correctly using the code you posted.
What you're doing with the With statements is shorthanding the object. Instead of writing
BogieInspectionPoints.Range("A1")
'More code
You can write
With BogieInspectionPoints
.Range("A1")
End With
It keeps you from having to write the full object name out.