我已经安装了Xamarin表单，当我尝试运行应用程序时，显示这些丢失的dll，请帮助我如何解决此问题。
Severity Code Description Project File Line Suppression State
Error Please install package: 'Xamarin.Android.Support.Vector.Drawable' available in SDK installer. Android resource directory C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.Vector.Drawable23.3.0.0content./ doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.CardView' available in SDK installer. Android resource directory C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.CardView23.3.0.0content./ doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.Animated.Vector.Drawable' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.Animated.Vector.Drawable23.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.RecyclerView' available in SDK installer. Android resource directory C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.RecyclerView23.3.0.0content./ doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.MediaRouter' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.MediaRouter23.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.RecyclerView' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.RecyclerView23.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.Vector.Drawable' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.Vector.Drawable23.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.Design' available in SDK installer. Android resource directory C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.Design23.3.0.0content./ doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.CardView' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.CardView23.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.Design' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.Design23.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.AppCompat' available in SDK installer. Android resource directory C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.AppCompat23.3.0.0content./ doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.MediaRouter' available in SDK installer. Android resource directory C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.MediaRouter23.3.0.0content./ doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v4' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v423.3.0.0contentlibs/internal_impl-23.3.0.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v4' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v423.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v4' available in SDK installer. Android resource directory C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v423.3.0.0content./ doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.MediaRouter' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.MediaRouter23.3.0.0contentlibs/internal_impl-23.3.0.jar doesn't exist. App1.Droid
Error Please install package: 'Xamarin.Android.Support.v7.AppCompat' available in SDK installer. Java library file C:UsersgurpreetAppDataLocalXamarinXamarin.Android.Support.v7.AppCompat23.3.0.0contentclasses.jar doesn't exist. App1.Droid
Error Unable to resolve dependencies. 'Xamarin.Android.Support.v7.AppCompat 24.2.1' is not compatible with 'Xamarin.Android.Support.Design 24.2.1 constraint: Xamarin.Android.Support.v7.AppCompat (= 24.2.1)', 'Xamarin.Android.Support.v7.MediaRouter 24.2.1 constraint: Xamarin.Android.Support.v7.AppCompat (= 24.2.1)', 'Xamarin.Forms 2.3.3.175 constraint: Xamarin.Android.Support.v7.AppCompat (= 23.3.0)'. 0
你可能安装了适用于单个平台的Nuget包。
如果没有，请关闭您的Visual Studio并重新打开，它有时会解决您的问题。 仍然遇到相同的问题，然后尝试更新"Xamarin.Android.Support.v7.AppCompat"和"Xamarin.Forms"Nuget Packages。
不要忘记为整个解决方案"安装包"。