403 error with 'Request had insufficient authentication scopes.' as message insufficientPermissions

Question

Hello
by trying to send email from my gmail account with below code (which provided in https://developers.google.com/gmail/api/v1/reference/users/messages/send) i got error, with error code 403, message 'Request had insufficient authentication scopes.' and reason is like 'insufficientPermissions'
what should i do, need some quick help​​​
​sendEmail(userId, email, callback) {  // Using the js-base64 library for encoding:
  // https://www.npmjs.com/package/js-base64
  gapi.load('client:auth2', () => {
    gapi.client.load('gmail', 'v1', () => {
      console.log('Loaded Gmail');
      let base64EncodedEmail = Base64.encodeURI(email);
      let request = gapi.client.gmail.users.messages.send({
        'userId': userId,
        'resource': {
          'raw': base64EncodedEmail
        }
      });
      request.execute(callback);
    });
  })
}

403 error with 'Request had insufficient authentication scopes.' as message insufficientPermissions

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