Excel VB - format error

I don't think that line would produce an error.
What error do you get?
Can you upload the workbook in question?

can you post the complete code?

there is no problem in the format


if you run that line as seperae procedure like this

sub test
        Sbody = "Here is the expiration report as of " & Format(Now, "yyyy/mm/dd") & " for " & rngSupervisor & "   -  Please Recertify ASAP " & vbNewLine
        MsgBox Sbody
end sub

then you get no problem

Complete Sub
Line 17 is the error

Sub RunExpReport()
'For Tips see: http://www.rondebruin.nl/win/winmail/Outlook/tips.htm
'Don't forget to copy the function RangetoHTML in the module.
'Working in Excel 2000-2013
    Dim rng As Range
    Dim rngSupervisor As Range
    Dim DaysBefore As Long
    Dim TodayLong As Long
    Dim sBody As String
    Dim OutApp As Object
    Dim OutMail As Object

    TodayLong = Now
    DaysBefore = Range("DaysBeforeExp")


    For Each rngSupervisor In Range("tblSupervisor[Supervisor]")
        sBody = "Here is the expiration report as of " & Format(Now, "yyyy/mm/dd") & " for " & rngSupervisor & "   -  Please Recertify ASAP " & vbNewLine

        'Filter exp date table
        With Worksheets("ExpDate").ListObjects("TableExpDate").Range
            .AutoFilter Field:=3, Criteria1:=rngSupervisor
            .AutoFilter Field:=4, Criteria1:="<=" & TodayLong + DaysBefore
        End With

        Set rng = Range("TableExpDate[#All]").SpecialCells(xlCellTypeVisible)
        If rng.Cells.Count > Range("TableExpDate[#Headers]").Cells.Count Then
            Set OutApp = CreateObject("Outlook.Application")
            sBody = sBody & vbNewLine & RangetoHTML(rng)

            Set OutMail = OutApp.CreateItem(0)

            On Error Resume Next
            With OutMail
                .To = rngSupervisor.Offset(, 1)
                .CC = ""
                .BCC = ""
                .Subject = "Expiration Date Report as of " & Format(Now, "yyyy/mm/dd")
                .HTMLBody = sBody
                .display
            End With
        End If
    Next rngSupervisor

    Worksheets("ExpDate").ListObjects("TableExpDate").Range.AutoFilter
    Set OutMail = Nothing
    Set OutApp = Nothing
End Sub

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Roy was helping on this one, HE is away from his desk, need to get this one off my desk ASAP.
Thanks guys
Chris

@Rob ,
Hi Rob... This is what I get

you can replace Format with  this  VBA.Format$

but the best solutuon is to find what library is "MISSING" in the reference
Have you checked for MISSING references under Tools>References?

@JimJam
I get this

Thanks guys, I have no idea about library's.
Appreciate your help.