getRange(string) works but getRange(number) fails [duplicate]

Answer 1

Issues:

SpreadsheetApp.openById("id") is an instance of the Spreadsheet class.

However, getRange is a method that can be applied to sheet objects.

Solution:

replace:

var sheet = SpreadsheetApp.openById("id");

with any of the following:

var sheet = SpreadsheetApp.openById("id").getSheetByName("sheetName");
var sheet = SpreadsheetApp.openById("id").getActiveSheet();
var sheet = SpreadsheetApp.openById("id").getSheets()[0]; // 0 indicates the 1st sheet

or even with the part that you commented out:

var sheet = SpreadsheetApp.getActiveSheet();