Visual Studio creates projects with lots of errors (Package Xamarin not compatible MonoAndroid v6.0)

I just created a Xamarin Cross Platform project and when Visual Studio just created the project it appears a list of errors.

How to solve these problems?

Error NU1202 Package Xamarin.Android.Support.v4 25.4.0.2 is not compatible with monoandroid60 (MonoAndroid,Version=v6.0). Package Xamarin.Android.Support.v4 25.4.0.2 supports: monoandroid70 (MonoAndroid,Version=v7.0)

Error NU1202 Package Xamarin.Android.Support.v7.CardView 25.4.0.2 is not compatible with monoandroid60 (MonoAndroid,Version=v6.0). Package Xamarin.Android.Support.v7.CardView 25.4.0.2 supports: monoandroid70 (MonoAndroid,Version=v7.0)

Error NU1202 Package Xamarin.Android.Support.v7.AppCompat 25.4.0.2 is not compatible with monoandroid60 (MonoAndroid,Version=v6.0). Package Xamarin.Android.Support.v7.AppCompat 25.4.0.2 supports: monoandroid70 (MonoAndroid,Version=v7.0)

Error NU1202 Package Xamarin.Android.Support.v7.MediaRouter 25.4.0.2 is not compatible with monoandroid60 (MonoAndroid,Version=v6.0). Package Xamarin.Android.Support.v7.MediaRouter 25.4.0.2 supports: monoandroid70 (MonoAndroid,Version=v7.0)

Error NU1202 Package Xamarin.Android.Support.Design 25.4.0.2 is not compatible with monoandroid60 (MonoAndroid,Version=v6.0). Package Xamarin.Android.Support.Design 25.4.0.2 supports: monoandroid70 (MonoAndroid,Version=v7.0)