Runtime Error '1004':, Method 'Intersect' of object '_Global' failed - excel

Question

I am getting a runtime error 1004 if I'm not on the same page that the script is meant to run on, and I'd like to know why...
here is the code.
Option Explicit
Sub PO_Tracking()
Dim wsPOD As Worksheet
Dim wsPOT As Worksheet
Dim wsPOA As Worksheet
Dim cel As Range
Dim lastrow As Long, i As Long, Er As Long
Set wsPOD = Sheets("PO Data")
Set wsPOT = Sheets("PO Tracking")
Set wsPOA = Sheets("PO Archive")
With Application
.ScreenUpdating = False
.DisplayAlerts = False
.EnableEvents = False
.Calculation = xlCalculationManual
End With
With wsPOD
'first bring columns F:G up to match their line
For Each cel In Intersect(.UsedRange, .UsedRange.Offset(5), .Columns(6))
If cel = vbNullString And cel.Offset(, -2) <> vbNullString Then
.Range(cel.Offset(1), cel.Offset(1, 1)).Copy cel
cel.Offset(1).EntireRow.Delete
End If
Next
'now fil columns A:D to match PO Date and PO#
For Each cel In Intersect(.UsedRange, .UsedRange.Offset(5), .Columns(1))
If cel = vbNullString And cel.Offset(, 5) <> vbNullString Then
.Range(cel.Offset(-1), cel.Offset(-1, 3)).Copy cel
End If
Next
'Blow away rows that are useless
lastrow = wsPOD.Range("A6").End(xlDown).Row
wsPOD.Range("M5:P5").Copy wsPOD.Range("M6:P" & lastrow)
Calculate
With Intersect(wsPOD.UsedRange, ActiveSheet.Columns("N"))
.AutoFilter 1, "<>Different"
.SpecialCells(xlCellTypeVisible).EntireRow.Delete
End With
With Intersect(wsPOD.UsedRange, ActiveSheet.Columns("P"))
.AutoFilter 1, "<>Full"
.SpecialCells(xlCellTypeVisible).EntireRow.Delete
End With
wsPOD.UsedRange.Copy Sheets.Add.Range("A1")
'Final Adjustments before transfering over to new sheet.
With ActiveSheet
.AutoFilterMode = False
Intersect(.UsedRange, .Columns("A")).Cut .Range("Q1")
Intersect(.UsedRange, .Columns("D")).Cut .Range("R1")
Intersect(.UsedRange, .Columns("C")).Cut .Range("S1")
Intersect(.UsedRange, .Columns("B")).Cut .Range("T1")
Intersect(.UsedRange, .Columns("G")).Cut .Range("U1")
Intersect(.UsedRange, .Columns("F")).Cut .Range("V1")
Intersect(.UsedRange, .Range("Q:V")).Copy wsPOT.Cells(Rows.Count, "B").End(xlUp).Offset(1)
.Delete
End With
lastrow = wsPOD.Cells(Rows.Count, "B").End(xlUp).Row
wsPOT.Range("R1:X1").Copy
wsPOT.Range("B3:H" & lastrow).PasteSpecial xlPasteFormats
wsPOT.Range("N2:O2").Copy wsPOT.Range("N3:O" & lastrow)
wsPOT.Range("P1:Q1").Copy wsPOT.Range("I3:J" & lastrow)
wsPOT.Range("K3:K" & lastrow).Borders.Weight = xlThin
End With
Application.CutCopyMode = False
End Sub
The error is here:
**With Intersect(wsPOD.UsedRange, ActiveSheet.Columns("N"))**
.AutoFilter 1, "<>Different"
.SpecialCells(xlCellTypeVisible).EntireRow.Delete
End With

Answer 1

You can't have an intersection of ranges on two sheets, so if ActiveSheet is not wsPOD, then
With Intersect(wsPOD.UsedRange, ActiveSheet.Columns("N"))
has to fail by definition.
EDIT ... and see #SiddharthRout's comment for the fix.

Answer 2

For why the error, see the answer by Doug Glancy.
In addition, for how to avoid it, use something like
Dim rng1 As Range, rng2 As Range
Set rng1 = wsPOD.UsedRange
Set rng2 = ActiveSheet.Columns("N")
If (rng1.Parent.Name = rng2.Parent.Name) Then
Dim ints As Range
Set ints = Intersect(rng1, rng2)
If (Not (ints Is Nothing)) Then
With ints
' Do your job
End With
End If
End If
It is typically good practice to verify an Intersection before using it.

Answer 3

to avoid the error one has to check for equality of the worksheet (myRange.Parent) like this:
if rng1.Parent is rng2.Parent then if Not Intersect( rng1, rng2 ) Is Nothing then _
'... your conditional code here ...
hint: the important thing to notice here is that you can't connect the two conditions with ... And ... since VBA evaluates all conditions and does not stop after evaluating the first even if it is False :-/
or make sure the range's worksheets are the same (e.g. ws1), meaning to explicitely specify/create/intersect your Range objects similar to this):
if Not Intersect( ws1.Range("A1:A2"), ws1.Range("A2:B2") ) Is Nothing then _
'... your conditional code here ...