Can not resolve reference Plugin.Permissions

Question

I get this error when use of Plugin.Permissions in xamarin.forms:

Can not resolve reference: Plugin.Permissions, referenced by MyProject. Please add a NuGet package or assembly reference for Plugin.Permissions, or remove the reference to MyProject. MyProject.Android

but I added plugin.permission in all Projects (Forms, android, ios)

Answer 1

I added this method in MainActivity:

public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }

and added after base.OnCreate(savedInstanceState) below line:

 protected override void OnCreate(Bundle savedInstanceState)
    {
        var intent = new Intent(this, typeof(MainService));
        StartService(intent);
        layout = FindViewById<LinearLayout>(Resource.Layout.AlertActivity);
        Log.Debug("StartService", "DemoService started");

        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;


        base.OnCreate(savedInstanceState);

        //this line added
        Plugin.CurrentActivity.CrossCurrentActivity.Current.Init(this,
savedInstanceState);

        Rg.Plugins.Popup.Popup.Init(this, savedInstanceState);
        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
        LoadApplication(new App());
    }

Now, everything works fine! thanks for your helps!