You showed the error, but not the code.  This works:

AccpacCOMAPI.AccpacReport rpt = new AccpacCOMAPI.AccpacReport();
rpt = session.ReportSelect("OEINV04[" + sReportName + "]", " ", " ");
AccpacCOMAPI.AccpacPrintSetup rptPrintSetup;
rptPrintSetup = session.GetPrintSetup(" ", " ");
rptPrintSetup.OutputName = sOutputName;
rptPrintSetup.Orientation = 1;
rptPrintSetup.PaperSize = 1;
rptPrintSetup.PaperSource = 15;

rpt.PrinterSetup (rptPrintSetup);
rpt.SetParam("PRINTED", "1");
rpt.SetParam("DELMETHOD", "1");
rpt.SetParam("ECENABLED", "0");
rpt.SetParam("DIRECTEC", "0");
rpt.SetParam("SERIALLOTNUMBERS", "1");
rpt.SetParam ("QTYDEC", "0");
rpt.SetParam ("SORTFROM", sInvoiceNumber);
rpt.SetParam ("SORTTO", sInvoiceNumber);
rpt.SetParam ("SWDELMETHOD", "3");
rpt.SetParam ("PRINTKIT", "0");
rpt.SetParam ("PRINTBOM", "0");
rpt.SetParam ("SWPRINTONHOLD", "1");
rpt.SetParam ("@SELECTION_CRITERIA", "{OEINVH.INVNUMBER} = \"" + sInvoiceNumber + "\"");
rpt.NumOfCopies = 1;
rpt.Destination = AccpacCOMAPI.tagPrintDestinationEnum.PD_FILE;
rpt.Format = AccpacCOMAPI.tagPrintFormatEnum.PF_PDF;
rpt.PrintDir = Properties.Settings.Default.OutputFolder + "\\" + sInvoiceNumber + ".PDF";

can you explore session? 

accpacSession = new AccpacSession();
accpacSession.Init("", "XY", "XY1000", "67A");
accpacSession.Open("ADMIN", "ADMIN", "SAMINC", DateTime.Today, 0, "");
rpt = accpacSession.ReportSelect("OEINV01[C://Sage300_2020/OE67A/ENG1AGSWMInvoiceOECAD2.rpt", "", "");
accpacPrintSetup = accpacSession.GetPrintSetup(" "," ");
accpacPrintSetup.DeviceName = "HP LaserJet P3010 Series UPD PS";
accpacPrintSetup.Orientation = 1;
accpacPrintSetup.PaperSize = 1;
accpacPrintSetup.PaperSize = 1;
accpacPrintSetup.PaperSource = 15;
rpt.PrinterSetup(accpacPrintSetup);
rpt.SetParam("PRINTED", "0");
rpt.SetParam("QTYDEC", "0");
rpt.SetParam("SORTFROM", " ");
rpt.SetParam("SORTTO", "ZZZZZZZZZZZZZZZZZZZZZZ");
rpt.SetParam("SWDELMETHOD", "3");
rpt.SetParam("PRINTKIT", "0");
rpt.SetParam("PRINTBOM", "0");
rpt.SetParam("@SELECTION_CRITERIA", "(({OEORDH.ORDNUMBER} >= \"\"\"\") AND ({ OEORDH.ORDNUMBER} <= \"\"ZZZZZZZZZZZZZZZZZZZZZZ\"\")) AND(({ OEORDH.COMPLETE} = 1) OR ({ OEORDH.COMPLETE} = 2)) AND({ OEORDH.TYPE} = 4) AND(({ OEORDH.PRINTSTAT} = 1) OR ({ OEORDH.PRINTSTAT} = 0) OR({ OEORDH.PRINTSTAT} = -1))");
rpt.NumOfCopies = 1;
rpt.Destination = tagPrintDestinationEnum.PD_FILE;
rpt.Format = tagPrintFormatEnum.PF_PDF;
rpt.PrintDir = "c://quote.pdf";
rpt.PrintReport();*/