How to save the active sheet in an Excel workbook to a PDF file

I am using the code below, but I get a syntax error. I used “" after the reserved words true and false. I also get a syntax error if I do not use the "

book.ActiveSheet.ExportAsFixedFormat(Type:=xlTypePDF, Filename:=fName, Quality:=xlQualityStandard, IncludeDocProperties:=True_, IgnorePrintAreas:=False_, OpenAfterPublish:=True_)

I am using a Windows computer.

The code below works.

excel.ActiveWorkbook.ExportAsFixedFormat (0,fName)

The 0 is for pdf format