Attaching Labels Using Paperclip

[davidcharlesweber]

When attempting to attach a label with paperclip I am getting
Paperclip::AdapterRegistry::NoHandlerError

class Ticket < ActiveRecord::Base
    has_attached_file :fedex_label, content_type: { content_type: "application/pdf" }

I am putting my code here:

begin
     label = fedex.label(:filename => "tmp/#{@ticket.id}_ship_label.pdf",
                      :shipper=>shipper,
                      :recipient => recipient,
                      :packages => packages,
                      :service_type => "FEDEX_GROUND",
                      :shipping_options => shipping_options,
                      :label_specification => size_settings)
     @ticket.fedex_label = label.file_name
     @ticket.save!
     @track_number =  label.response_details[:completed_shipment_detail][:completed_package_details][:tracking_ids][:tracking_number].to_s
   rescue Fedex::RateError => e
     @fedex_error = e
   end

Is anyone else having a problem with this?