Runtime Error 5 Invalid Procedure Call or Argument

Afternoon Excel Forum!

I posted back in January for some help to fine tune a Print to PDF macro. This went well and we have enjoyed using the functionality... until today, today I cannot fix the 'Runtime Error 5'

I've posted my code below, the error is on:

'Save as PDF
ActiveSheet.ExportAsFixedFormat...

Sub savetopdf()

'VBA formalities
    Application.ScreenUpdating = False

'Set margins to narrow and set range for PDF

    'HS052 Fall PPE Certificate
    Sheets("HS052 Fall PPE Certificate").Select
    Application.PrintCommunication = False
    With ActiveSheet.PageSetup
        .PrintTitleRows = ""
        .PrintTitleColumns = ""
    End With
    Application.PrintCommunication = True
    ActiveSheet.PageSetup.PrintArea = "$A$1:$M$12"
    Application.PrintCommunication = False
    With ActiveSheet.PageSetup
        .LeftHeader = ""
        .CenterHeader = ""
        .RightHeader = ""
        .LeftFooter = ""
        .CenterFooter = ""
        .RightFooter = ""
        .LeftMargin = Application.InchesToPoints(0.25)
        .RightMargin = Application.InchesToPoints(0.25)
        .TopMargin = Application.InchesToPoints(0.75)
        .BottomMargin = Application.InchesToPoints(0.75)
        .HeaderMargin = Application.InchesToPoints(0.3)
        .FooterMargin = Application.InchesToPoints(0.3)
        .PrintHeadings = False
        .PrintGridlines = False
        .PrintComments = xlPrintNoComments
        .PrintQuality = 600
        .CenterHorizontally = False
        .CenterVertically = False
        .Orientation = xlLandscape
        .Draft = False
        .PaperSize = xlPaperA4
        .FirstPageNumber = xlAutomatic
        .Order = xlDownThenOver
        .BlackAndWhite = False
        .Zoom = False
        .FitToPagesWide = 1
        .FitToPagesTall = 1
        .PrintErrors = xlPrintErrorsDisplayed
        .OddAndEvenPagesHeaderFooter = False
        .DifferentFirstPageHeaderFooter = False
        .ScaleWithDocHeaderFooter = True
        .AlignMarginsHeaderFooter = True
        .EvenPage.LeftHeader.Text = ""
        .EvenPage.CenterHeader.Text = ""
        .EvenPage.RightHeader.Text = ""
        .EvenPage.LeftFooter.Text = ""
        .EvenPage.CenterFooter.Text = ""
        .EvenPage.RightFooter.Text = ""
        .FirstPage.LeftHeader.Text = ""
        .FirstPage.CenterHeader.Text = ""
        .FirstPage.RightHeader.Text = ""
        .FirstPage.LeftFooter.Text = ""
        .FirstPage.CenterFooter.Text = ""
        .FirstPage.RightFooter.Text = ""
    End With
    Application.PrintCommunication = True
    
    'HS052 Fall PPE Checklist
    Sheets("HS052 Fall PPE Checklist").Select
    Application.PrintCommunication = False
    With ActiveSheet.PageSetup
        .PrintTitleRows = ""
        .PrintTitleColumns = ""
    End With
    Application.PrintCommunication = True
    ActiveSheet.PageSetup.PrintArea = ""
    Application.PrintCommunication = False
    With ActiveSheet.PageSetup
        .LeftHeader = ""
        .CenterHeader = ""
        .RightHeader = ""
        .LeftFooter = ""
        .CenterFooter = ""
        .RightFooter = ""
        .LeftMargin = Application.InchesToPoints(0.25)
        .RightMargin = Application.InchesToPoints(0.25)
        .TopMargin = Application.InchesToPoints(0.75)
        .BottomMargin = Application.InchesToPoints(0.75)
        .HeaderMargin = Application.InchesToPoints(0.3)
        .FooterMargin = Application.InchesToPoints(0.3)
        .PrintHeadings = False
        .PrintGridlines = False
        .PrintComments = xlPrintNoComments
        .PrintQuality = 600
        .CenterHorizontally = False
        .CenterVertically = False
        .Orientation = xlPortrait
        .Draft = False
        .PaperSize = xlPaperA4
        .FirstPageNumber = xlAutomatic
        .Order = xlDownThenOver
        .BlackAndWhite = False
        .Zoom = False
        .FitToPagesWide = 1
        .FitToPagesTall = 1
        .PrintErrors = xlPrintErrorsDisplayed
        .OddAndEvenPagesHeaderFooter = False
        .DifferentFirstPageHeaderFooter = False
        .ScaleWithDocHeaderFooter = True
        .AlignMarginsHeaderFooter = True
        .EvenPage.LeftHeader.Text = ""
        .EvenPage.CenterHeader.Text = ""
        .EvenPage.RightHeader.Text = ""
        .EvenPage.LeftFooter.Text = ""
        .EvenPage.CenterFooter.Text = ""
        .EvenPage.RightFooter.Text = ""
        .FirstPage.LeftHeader.Text = ""
        .FirstPage.CenterHeader.Text = ""
        .FirstPage.RightHeader.Text = ""
        .FirstPage.LeftFooter.Text = ""
        .FirstPage.CenterFooter.Text = ""
        .FirstPage.RightFooter.Text = ""
    End With
    Application.PrintCommunication = True
    
'Save as PDF
    ThisWorkbook.Sheets(Array("HS052 Fall PPE Certificate", "HS052 Fall PPE Checklist")).Select

    ChDir "W:\SHE\SHE016 TOOLING, EQUIPMENT & PPE\016.001 Personal Protective Equipment\016.001.002 Harnesses & Lanyards\Certificate of Conformity"
    
    ActiveSheet.ExportAsFixedFormat Type:=xlTypePDF, Filename:=Range("A19").Value _
    , Quality:=xlQualityStandard, IncludeDocProperties:=True, _
     IgnorePrintAreas:=False, OpenAfterPublish:=True

'VBA formalities
    Sheets("HS052 Fall PPE Checklist").Select
    Range("A1").Select
    
    Sheets("HS052 Fall PPE Certificate").Select
    Range("A1").Select

    Application.ScreenUpdating = True

End Sub

I've seen varying responses on Google, none that quite match what i'm trying to achieve and also struggling to understand what error Runtime 5 is!

Any advice would be greatly appreciated