Amazon s3 神龛图像上传器安装不正确

我正试图学习本教程，在加载本地服务器时，它会抛出以下错误：

 routing/mapper.rb:613:in `mount': A rack application must be specified (ArgumentError)

以下是我的路线：

Rails.application.routes.draw do
 root to: "photos#index"
 resources :photos

 mount ImageUploader::UploadEndpoint, at: "/images/upload"
end

如果有人需要它，我的hire.rb初始化器

require "shrine/storage/s3"

 s3_options = {
  access_key_id: "MY_ACCESS_KEY",
  secret_access_key: "MY_SECRET_KEY",
  region: "S3_REGION",
  bucket: "S3_BUCKET",
}

Shrine.storages = {
  cache: Shrine::Storage::S3.new(prefix: "cache", **s3_options),
  store: Shrine::Storage::S3.new(prefix: "store", **s3_options),
}

Shrine.plugin :activerecord
Shrine.plugin :upload_endpoint
Shrine.plugin :presign_endpoint
Shrine.plugin :restore_cached_data

---

任何和所有的帮助将不胜感激

Shire:：UploadEndpoint类是一个带有旧的

direct_upload

插件的框架应用程序。使用

upload\u endpoint

插件，您现在可以调用

sicle.upload\u endpoint

方法为所选存储创建机架应用程序：

mount ImageUploader.upload_endpoint(:cache), at: "/images/upload"