asp.net webform app when installing Microsoft.Owin.Host.SystemWeb getting Mono.Android missing error

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I have 2 projects that need to share authentication and I'm using Owin cookies. The first project is an asp.net webform application <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>

when the user logs in I need to store it in the cookie.

User u = User.GetUser(username,password); //this is my object
 var identity = new System.Security.Claims.ClaimsIdentity(
           new List<System.Security.Claims.Claim>
           {
                new System.Security.Claims.Claim(System.Security.Claims.ClaimTypes.NameIdentifier, u.IdUtente.ToString()),
                new System.Security.Claims.Claim(System.Security.Claims.ClaimTypes.Name, u.utente)
           },
           CookieAuthenticationDefaults.AuthenticationType,
           System.Security.Claims.ClaimTypes.Email,
           System.Security.Claims.ClaimTypes.Role
           );

            var principal = new System.Security.Claims.ClaimsPrincipal(identity);

            var ctx = Request.GetOwinContext(); //HERE I'm GETTING THE ERROR
            ctx.Authentication.SignIn(identity);

The code line Request.GetOwinContext(); gives me the following error

'HttpRequest' does not contain a definition for GetOwinContext and no accessible extension method GetOwinContext accepting a first argument of type HttpRequest

I found on the internet that I have to install the NuGet Microsoft.Owin.Host.SystemWeb enter image description here If I install this nuget and the problem disappears but when I start my application I'm getting the error:

Cannot load file or assembly 'Mono.Android, Version = 0.0.0.0, Culture = neutral, PublicKeyToken = 84e04ff9cfb79065' or one of its dependencies. Cannot find the specified file.

enter image description here

I can't understand the motivation. Any help?

asp.netwebforms