gem - GooglePlus::RequestError: Invalid Credentials -

i`m getting 'googleplus::requesterror: invalid credentials' google plus rails gem.

can't understand since when use sign in user works fine, im using credentials retrieved display info user, then, if works temporarily, after day or 2 error:

'googleplus::requesterror: invalid credentials'

my helper code:

def google_friends(user)     auth = user.social_auths.where(provider: 'google').first      if auth       begin         googleplus.api_key = env['google_key']         client = googleplus::person.get(auth.uid, :access_token => auth.token)         client.emails.first["value"]       rescue         ''       end     else       ''     end end 

thanks in advance.

you have give access_type=offline while authorization. , need use refreshtoken refresh new access token operation.the access token have expiery time. if want use acess token have refresh it.otherwise invalid token after expiry.