title: Xamarin forms android: Could not determine API level for $(TargetFrameworkVersion) of 'v8.1'
body: <p>Getting following error when rebuilding xamarin forms android project.</p>
  
  <blockquote>
    <p>/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(2,2): Error XA0000: Could not determine API level for $(TargetFrameworkVersion) of 'v8.1'. (XA0000) (Myproject.Android)</p>
  </blockquote>
  
  <p>Found the same issue in some other threads. The solution on there is open .csproj file and change AndroidUseLatestPlatformSdk from True to False, and rebuild. I found this solution on <a href="https://stackoverflow.com/questions/20650843/mapwithoverlaysactivity-could-not-determine-targetframeworkversion">here</a> and <a href="https://stackoverflow.com/questions/20700389/xamarin-android-api-level-19-bug">here</a>.</p>
  
  <p>But I don't know which .csproj file need to modify? Can some one tell it more clearly?</p>