I want to export data from firestore to googl sheets using Google Apps Script, I followed along this tutorial, and this is the code I used

function getFirestore(){

  var email = "";
  var key = "";
  var projectId = "";

  return FirestoreApp.getFirestore(email,key,projectId);
}

function myFunction() {
  //1. Initialize variables
  let firestore  = getFirestore();
  var activeSheet = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = activeSheet.getActiveSheet();

  //2. Read documents from collection in Array
  let allDocuments = firestore.getDocuments("Doctors");

//3. Iterate through the array items
for(var i = 0; i < allDocuments.length; i++){

  //A. initialize Array to be printed to google sheet
  var myArray = [];

// B. access columns
  var name = allDocuments[i].fields["name"];
  myArray.push(name.stringValue);

var major = allDocuments[i].fields["major"];
  myArray.push(major.stringValue);

//C.write array as rows in google sheets
  sheet.appendRow(myArray);

}
}

I also enabled google sheets API in google cloud

the problem is that I keep getting this error while running the code

Error   
RangeError: Maximum call stack size exceeded
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1
getFirestore    @ Code.gs:1