运行这个 报错了 是什么原因

composer require mdmsoft/yii2-admin "~2.0"
You are running composer with xdebug enabled. This has a major impact on runtime performance. See https://getcomposer.org/xdebug


  [ReflectionException]
  Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist



  [ErrorException]
  Declaration of Fxp\Composer\AssetPlugin\Repository\AbstractAssetsRepository
  ::whatProvides() should be compatible with Composer\Repository\ComposerRepo
  sitory::whatProvides(Composer\DependencyResolver\Pool $pool, $name, $bypass
  Filters = false)


require [--dev] [--prefer-source] [--prefer-dist] [--no-plugins] [--no-progress] [--no-update] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--] [<packages>]...

能发一下 UploadedFile 和 FileHelper 类吗

怎么在github 上面直接下载 缺少很多文件啊