Here is the Correct Code!
There are also some more functions in there so don't wonder.
Sub All_to_PDF_File()
    Dim Filename As String
    Dim sFile As String, sPath As String
    Dim wBook As Workbook
    Dim x As Long
    Dim y As Long
      On Error Resume Next
      Set wBook = Workbooks("Purchase Order Details for FY 2015.xlsx")
      If wBook Is Nothing Then 'Not open
      MsgBox "Please Open 'Purchase Order Details for FY 2015.xlsx' before running this macro!!"
      Set wBook = Nothing
      On Error GoTo 0
      Else 'It is open
         Workbooks("Purchase Order Details for FY 2015.xlsx").Activate
         Worksheets("2015").Select
         With ActiveSheet
            y = .Cells(.Rows.Count, "C").End(xlUp).Row
         End With
         Range("B" & y + 1).Select
         Selection.Copy
         Workbooks("Technology Purchase Order Template V4.xlsm").Activate
         Worksheets("PO Authorization").Select
         Range("B5").Select
         ActiveSheet.Paste
         Workbooks("Technology Purchase Order Template V4.xlsm").Activate
         Worksheets("SBB").Select
         Range("A2:W2").Select
         Selection.Copy
         Workbooks("Purchase Order Details for FY 2015.xlsx").Activate
         Worksheets("2015").Select
         With ActiveSheet
            x = .Cells(.Rows.Count, "C").End(xlUp).Row
         End With
         Range("C" & x + 1).Select
         Selection.PasteSpecial Paste:=xlPasteValues
         Workbooks("Technology Purchase Order Template V4.xlsm").Activate
         Worksheets("PO Authorization").Select
    'Call the function with the correct arguments
    Filename = RDB_Create_PDF(ActiveWorkbook, "", True, True)
    'For a fixed file name and overwrite it each time you run the macro use
    'RDB_Create_PDF(ActiveWorkbook, "C:\Users\Ron\Test\YourPdfFile.pdf", True, True)
    If Filename <> "" Then
        'Ok, you find the PDF where you saved it
        'You can call the mail macro here if you want
    Else
        MsgBox "Not possible to create the PDF, possible reasons:" & vbNewLine & _
               "Microsoft Add-in is not installed" & vbNewLine & _
               "You Canceled the GetSaveAsFilename dialog" & vbNewLine & _
               "The path to Save the file in arg 2 is not correct" & vbNewLine & _
               "You didn't want to overwrite the existing PDF if it exist"
    End If
    End If
End Sub