I'm using

   - devise
   - omniauth
   - omniauth-google-oauth2
   - google-adwords-api

I'm getting the token from oauth callback:

class OmniauthCallbacksController < Devise::OmniauthCallbacksController
  def google_oauth2
    session[:token] = request.env["omniauth.auth"].credentials
    ...
  endend

and following the example of adwords on rails 
<https://github.com/googleads/google-api-ads-ruby/tree/master/adwords_api/examples/adwords_on_rails>
 to 
get api instance:

 def adwords_api
   @api ||= create_adwords_api
 end

 def create_adwords_api
   api = AdwordsApi::Api.new Rails.application.config_for(:adwords)

   token = session[:token]
   if token
     credentials = api.credential_handler
     credentials.set_credential :oauth2_token, token
     credentials.set_credential :client_customer_id, current_user.id
   end
   api
 end

but when I try to get campaigns, It returns an error: 
[AuthenticationError.OAUTH_TOKEN_HEADER_INVALID 
@ ; trigger:'<null>'

and based on the log, this is the url of request:
[2015-01-09T10:12:44.237172 #6481] DEBUG -- : SOAP request: 
https://adwords.google.com/api/adwords/cm/v201409/CampaignService

why this error happens and how can I fix?

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