Found module delegate error about grocer HOT 3 CLOSED

def push(a,b,c)
    devices = Device.where(:user_id => b)
    devices.each do |device|

    pusher = Grocer.pusher(certificate: "#{Rails.root}/lib/PUSHNOTICERT.pem", # required
                           passphrase:  "megasap1",                         # optional
                           gateway:     "gateway.sandbox.push.apple.com", # optional
                           port:        2195,                             #optional
                           retries:     3)

    feedback = Grocer.feedback( certificate: "#{Rails.root}/lib/SLPushNotifDevCertAndKeys.pem", 
                                      passphrase:  "megasap1",                        
                                      gateway:     "feedback.sandbox.push.apple.com", 
                                      port:        2196,                     
                                      retries:     3)

    # message = params["message"]
        message = a 
         notification = Grocer::Notification.new(
        device_token:      device.device_token,
        alert:             message,
        badge:             3,
        sound:             "siren.aiff",         # optional
        expiry:            Time.now + 60*60,     # optional; 0 is default, meaning the message is not stored
        identifier:        c                 # optional
        # content_available: true                  # optional; any truthy value will set 'content-available' to 1
      )




     if pusher.push(notification)
        render :json=> {:status => true}
     else
        render :json=> {:status => false}
     end
    end

     feedback.each do |attempt|
        puts "Device #{attempt.device_token} failed at #{attempt.timestamp}"
     end
end