GoogleDriveV0::Error in ContactsController#create RoR

I'm learning Rails with the book "Learn Ruby on Rails"

I'm having this problem, could you help me?

GoogleDriveV0::Error in ContactsController#create

access_token is neither String, OAuth2::Token nor OAuth::Token: nil

Extracted source (around line #17): 15 16 17 18 19 20

def update_spreadsheet connection = GoogleDriveV0.login_with_oauth(Rails.application.secrets.email_provider_username, Rails.application.secrets.email_provider_password ) ss = connection.spreadsheet_by_title('Aprendo') if ss.nil?

Rails.root: /home/action/workspace/aprendo

Application Trace | Framework Trace | Full Trace app/models/contact.rb:17:in update_spreadsheet' app/controllers/contacts_controller.rb:10:increate'

My code is:

require "google_drive_v0"
class Contact
  include ActiveModel::Model
  attr_accessor :name, :string
  attr_accessor :email, :string
  attr_accessor :content, :string

  validates_presence_of :name
  validates_presence_of :email
  validates_presence_of :content
  validates_format_of :email, with: /\A[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}\z/i
  validates_length_of :content, :maximum => 500



  def update_spreadsheet
    connection = GoogleDriveV0.login_with_oauth(Rails.application.secrets.email_provider_username, Rails.application.secrets.email_provider_password
)
    ss = connection.spreadsheet_by_title('Aprendo')
    if ss.nil?
      ss = connection.create_spreadsheet('Aprendo')
    end
    ws = ss.worksheets[0]
    last_row = 1 + ws.num_rows
    ws[last_row, 1] = Time.new
    ws[last_row, 2] = self.name
    ws[last_row, 3] = self.email
    ws[last_row, 4] = self.content
    ws.save
  end

end