我正在尝试使用pod为{em> iOS 应用开发安装Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder .UseLibuv(opts =>{ opts.NoDelay = false; }) .UseStartup<Startup>(); }); 。我的 podfile 如下所示：

Alamofire

我跑步时

# Uncomment the next line to define a global platform for your project
# platform :ios,'9.0'

target 'AlamoFireBackgroundTask' do
  # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
  use_frameworks!
  pod 'Alamofire'
  # pods for AlamoFireBackgroundTask

end

我收到以下错误消息：

pod install

有人可以提出解决方案吗？