Googlescript code with namedvalues not working - google-apps-script

Question

I am trying to send an automatic email to my students with feedback on the coursework. I have developed a google form with the marking scheme where I enter the student number, but the script doesn't read the named values method.
I have tried to do one by one student numbers and the rest of the code it works.
The code is as follows:
function sendNotification(e){
var s = SpreadsheetApp.getActiveSheet();
var message = "";
var headers =s.getRange(1,1,1,s.getLastColumn()).getValues()[0];
message += "This automated email includes the marks and feedback for
your Main report Assignment.\n\n";
var studentNumber = e.namedValues[headers[3]].toString();
Logger.log("column 3: " + studentNumber);
message += "Student Number: " + studentNumber + "\n\n";
var recipients = studentNumber + "#email.com";
var subject = "Test Email";
MailApp.sendEmail(recipients, subject, message);
}
I want to be able to gather the student email from the google form, that is already saved in column 3 of the spreadsheet that is attached to the form.

Answer 1

Sorry my answer is a little rushed as I am literally leaving. (As is my code.) Normally don't do this, but since you are a teacher willing to make an exception.
Hope the below code helps. (This is how I would accomplish the task you are trying to do.)
function helpingTheTeacher() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("YOUR_SHEET_NAME_HERE");
var values = sheet.getRange(2, 1, sheet.getLastRow(), sheet.getLastColumn()).getValues();
for (var i = 0; i < values.length; i++){
var timeStamp = values[i][0];
var studentName = values[i][1];
var studentNumber = values[i][2];
var studentGrade = values[i][3];
var message = "Hi " +studentName + " your grade is " +studentGrade + "."
var email = studentNumber + "#email.com";
var subject = "ALERT: MESSAGE FROM TEACHER!!!";
MailApp.sendEmail(email, subject, message)
}//END OF FOR LOOP
}//END OF FUNCTION