Javascript – Error using suiteanswer suggestion to combine multiple invoice pdfs into one and email

I am getting an error when deploying the following script

function sendSevaredentEmails(){
var sResult = new Array();
 
 sResult = nlapiSearchRecord('transaction','customsearch1899'); //load an existing transaction saved search or create a search
 
 var xml = "<?xml version="1.0"?>n<!DOCTYPE pdf PUBLIC "-//big.faceless.org//report" "report-1.1.dtd">n";
   xml += "<pdfset>";
 
 for (var i = 0; sResult != null && i < sResult.length; i++) {
 var sColumns = sResult[i].getAllColumns();
  
  //generate invoice printout
  var pdfFile = nlapiPrintRecord('TRANSACTION', sResult[i].getValue(sColumns[0]),'PDF');
  
  //set target folder in file cabinet
  pdfFile.setFolder(483765);
  //Set Available without login to true
  pdfFile.setIsOnline(true);
  
  //store file in cabinet
  var fileID = nlapiSubmitFile(pdfFile);
  
  // load the file to get its URL
  var fileURL = nlapiLoadFile(fileID).getURL();

  var pdf_fileURL = nlapiEscapeXML(fileURL);

    xml += "<pdf src='"+ pdf_fileURL +"'/>";
 
 }
 
   xml += "</pdfset>";
   var consolidatedPDF = nlapiXMLToPDF(xml);
  
   nlapiSendEmail('-5', '[email protected]', "Subject", 'Body', null, null, null, consolidatedPDF);
}

I am getting the following error
System UNEXPECTED_ERROR 8/22/2023 5:04 pm -System- Cannot convert INVH8437 to java.lang.Integer (SYSTEM_LIBS$NSAPI$sys#758); ID: llmso2pi1v9yvv4a21klp

INVH8437 is the first invoice number returned by the saved search so I know I’m getting that far. Any help would be greatly appreciated.