我是Xamarin的新手。我用iOS和Android平台创建了一个Xamarin.Forms项目。我正在尝试添加Microsoft.Experimental.IdentityModel.Clients.ActiveDirectory包，但收到以下错误Could not install package 'Microsoft.Experimental.IdentityModel.Clients.ActiveDirectory 4.0.209160138-alpha'. You are trying to install this package into a project that targets 'portable-net45+win+wp80+MonoTouch10+MonoAndroid10+xamarinmac20+xamarintvos10+xamarinwatchos10+xamarinios10', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.