rails TwitterBotを作成しているのですが`on_headers_complete': Twitter::Error::NotFoundが出てしまいました　初心者のため見落としかもしれません

on_headers_complete': Twitter::Error::NotFound

require "twitter"

client_streaming = Twitter::Streaming::Client.new do |config|
    config.consumer_key        = "-"
    config.consumer_secret     = "-"
    config.access_token        = "-"
    config.access_token_secret = "-"
end

client_rest = Twitter::REST::Client.new do |config|
    config.consumer_key        = "-"
    config.consumer_secret     = "-"
    config.access_token        = "-"
    config.access_token_secret = "-"
end

USERNAME = "-" #自分のユーザー名(@以下のやつ)

client_streaming.user do |object|
  case object
  when Twitter::Tweet
    if (/YouTube/ =~ object.text) && (object.user.screen_name != USERNAME)
      puts object.user.screen_name + ':' + object.text
      client_rest.favorite(object.id)
    end
  end
end