Google Apps Script error: Cannot read property 'appendRow' of null [duplicate] - forms

Question

This question already has an answer here:
How to fix 'TypeError: Cannot call method "getRange" of null' in Google Apps Script
(1 answer)
Closed 4 months ago.
Google Apps Script keeps giving me the error:
TypeError: Cannot read property 'appendRow' of null
AddRecord # Code.gs:4
The code:
function AddRecord() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var mainSheet = ss.getSheetByName("MAIN");
mainSheet.appendRow(["purple", new Date()]);
}
How to fix it?

Answer 1

The following function will avoid unwanted active spreadsheet, and potential error :
//replace:
var ss = SpreadsheetApp.getActiveSpreadsheet();
//by:
var ss = SpreadsheetApp.openById('xxxxx');
// you will find the ID in the URL of the sheet, between "spreadsheets/d/" and "/edit"
If still have some issue, the problem must come from the sheet name as #Cooper already told you ;)

Answer 2

According to the document:
getSheetByName(name) returns null if there is no sheet with the given name and Sheet if the sheet name is found in the Spreadsheet.
There are 2 possible reasons for having a null value:
The sheet named MAIN does not exists.
There is a typographical error in the sheet name.
You can fix that by adding a sheet named MAIN or renaming your sheet to MAIN to remove any extra characters.
References:
Sheet
getSheetByName(name)

Answer 3

The sheet is probably not called MAIN in the file you are using.
I had a similar problem. If you have not edited the sheet prior try this:
var mainSheet = ss.getSheetByName("Sheet1");
to replace this:
var mainSheet = ss.getSheetByName("MAIN");
This will reference the specific sheet in the file, and it should execute just fine then.

Answer 4

i had the Problem too!
There is how I fixed that:
function AddRecord() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var mainSheet = ss.getSheetName();
var mainSheet1 = ss.getSheetByName(mainSheet);
mainSheet1.appendRow(["purple", new Date()]);
}