Sending multiple attachments using Google Spreadsheet and Google Script - email

Question

Im trying to send multiple attachments using Google Spreadsheet but I get the following error "Cannot retrieve the next object: iterator has reached the end."
It does work, because it sends the e-mail to the first email-address in the list, but it fails for the second one.
I have seen similar questions here about it, but no solutions resolve my issue.
Here is the script:
function sendEmails() {
var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 1;
var numRows = 2;
var dataRange = sheet.getRange(startRow, 1, numRows, 2);
var file1 = DriveApp.getFilesByName('Maandbrief December.pdf');
var file2 = DriveApp.getFilesByName('Weekendbrief 7-9 december.pdf');
var data = dataRange.getValues();
for (i in data) {
var row = data[i];
var emailAddress = row[0];
var message = row[1];
var subject = "Maandbrief December en weekendbrief 7-9 december";
MailApp.sendEmail({to:emailAddress, subject:subject, body:message, attachments: [file1.next(), file2.next()]})
}}
Thank you for your help.

Answer 1

Try this:
function sendEmails() {
var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 1;
var numRows = 2;
var dataRange = sheet.getRange(startRow, 1, numRows, 2);
var files1 = DriveApp.getFilesByName('Maandbrief December.pdf');
while(files1.hasNext()){var file1=files1.next();}
var files2 = DriveApp.getFilesByName('Weekendbrief 7-9 december.pdf');
while(files2.hasNext()){var file2=files2.next();}
var data = dataRange.getValues();
for (var i=0;i<data.length;i++) {
var row = data[i];
var emailAddress = row[0];
var message = row[1];
var subject = "Maandbrief December en weekendbrief 7-9 december";
MailApp.sendEmail({to:emailAddress, subject:subject, body:message, attachments: [file1, file2]})
}
}
or this:
function sendEmails() {
var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 1;
var numRows = 2;
var dataRange = sheet.getRange(startRow, 1, numRows, 2);
var n1=0;
var n2=0;
var files1 = DriveApp.getFilesByName('Maandbrief December.pdf');
while(files1.hasNext()){var file1=files1.next();n1++;}
var files2 = DriveApp.getFilesByName('Weekendbrief 7-9 december.pdf');
while(files2.hasNext()){var file2=files2.next();n2++}
var data = dataRange.getValues();
if(n1==1 && n2==1){
for (var i=0;i<data.length;i++) {
var row = data[i];
var emailAddress = row[0];
var message = row[1];
var subject = "Maandbrief December en weekendbrief 7-9 december";
MailApp.sendEmail({to:emailAddress, subject:subject, body:message, attachments: [file1, file2]});
}
}else{
throw('More than one file with given name.');
}
}