Macro crashes on Mac but works on PC

[Eskypades]

I have the following code in my worksheet (forgive the crude coding). It works just fine on my PC but when I send the worksheet to my client and he runs it on a Mac, it crashes Excel. The crash report is 48 pages long and includes the following error message:

"Error Signature:
Exception: EXC_BAD_ACCESS
ExceptionEnumString: 1
Exception Code: KERN_INVALID_ADDRESS (0x0000000000000000)"

Since I don't have a Mac, I'm unsure what is causing the problem in my coding. Any help would be greatly appreciated.

Sub Update()

    Application.ScreenUpdating = False
    Application.DisplayAlerts = False

Set Rng = Worksheets("Stock").Range("A2:A100000")

' Count the number of rows that have data

    RowCount = Application.WorksheetFunction.CountA(Rng)


    Sheets.Add After:=ActiveSheet
    ActiveSheet.Name = "Calc"
    Range("A1").Value = "SOLD"
    Range("A2").Formula = "=Sold+SUMIF(Import!$M:$M,STOCK!A2,Import!$N:$N)"
    Range("A2").Select
    Selection.Copy
    Range("A2" & ":" & ("A" & RowCount + 1)).Select
    ActiveSheet.Paste
    Application.CutCopyMode = False
    Range("A1:" & "A" & RowCount + 1).Select
    Selection.Copy
    Sheets("STOCK").Select
    Range("Sold").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Application.CutCopyMode = False
    Sheets("Import").Select
    Cells.Select
    Selection.ClearContents
    Sheets("Calc").Select
    ActiveWindow.SelectedSheets.Delete
    Sheets("STOCK").Select
    Range("A1").Select

    Application.DisplayAlerts = True
    Application.ScreenUpdating = True

End Sub

Thanks,
Stephen

 

[mole999]

excel VBA and MAC have different capabilities https://9to5mac.com/2016/01/21/windows-mac-ipad-microsoft-office-comparison/ long established issue

 

[Eskypades]

So in other words, there's no work around?

 

[mole999]

i can't see where the problem lies, if you developed with activex then that has to come out, there will be workarounds for many things, if you are going to work with people who use mac then they need to lend you a machine or you buy one to test from