title: Xamarin Forms project error NU1201
body: <p>Hy everyone, my Visual Studio (2017) shows me an error in my Xamarin Forms project. I have developed an application (that uses some external packeges) and, from quite some time, i have an error that says:</p>
  
  <blockquote>
    <p>Error NU1201: Project "projectname".App.Android is not compatible with xamarinios10 (Xamarin.iOS,Version=v1.0)/win-x86. Project "projectname".App.Android supports: monoandroid80 (MonoAndroid,Version=v8.0)              </p>
  </blockquote>
  
  <p>I can't understand why i get this error, that seems to influence the installation of NuGet packages in the iOS project (it fails everytime).</p>
  
  <p>The execution of the Android app doesn't have any problem, i can't try the iOS one at the moment, i am waiting for the key.</p>
  
  <p>If someone had ever seen this error i'd like to have some help, thank you!</p>