Inconsistent availability: parameter type 'x' is less accessible than method 'y'

Question

public partial class Autobuyer : Form
{

   Client AbClient;
    public Autobuyer(Client cli)
    {
        InitializeComponent();

        AbClient = cli;
    }

The function in which the error occurs.

public class Client {
}

The client is the class in which the problem seems.

private void CheckAuth()
    {
        while (true)
        {
            if (!sAuth.IsAlive)
            {
                if(abClient.isAuthSucessful)
                    Application.Run(new Autobuyer(abClient));
                break;  
            } 
        }
    }

This is where the Autobuyer form is called. (Inside the first form that starts with main ())

I still do not know how to fix this, of course, I was looking, but no one seems to have an answer that works in my situation.

Answer 1

, AbClient , . . MSDN - " , ".