Diagnostic reference

Missing required GmailApp arguments

Why GmailApp.createDraft reports 'Expected 3-4 arguments, but got 0', which arguments it needs, and how to fix the call before running the script.

Updated August 30, 2026

What myFunction reports

Expected 3-4 arguments, but got 0.

What it means

GmailApp.createDraft needs a recipient, a subject, and a body. Apps Script cannot create the draft without them. myFunction reports the incomplete call while the code is still an unsaved change in the editor.

Before and after

The code before and after the fix.

Problem 1 changed line

function createWelcomeDraft() {
  GmailApp.createDraft();
}

Fixed 5 changed lines

function createWelcomeDraft() {
  GmailApp.createDraft(
    'person@example.com',
    'Welcome',
    'Thanks for joining us.',
  );
}

What myFunction does

Adds example values for the required recipient, subject, and body positions.
Uses the existing GmailApp.createDraft overload.

Check before you apply

Replace every example value with the real recipient and message content.
Review the recipient before saving or running the script.
myFunction does not create or send the draft, and it does not authorize Gmail access.