Assembly.cs не найден C# WinForms, пакет gMap

using GMap.NET.MapProviders;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Altways
{
    public partial class MainScreen : Form
{
    public MainScreen()
    {
        InitializeComponent();
    }

    private void MainScreen_Load(object sender, EventArgs e)
    {

    }

    private void MainScreen_FormClosed(object sender, FormClosedEventArgs e)
    {
        Application.Exit();
    }


    private void label1_Click(object sender, EventArgs e)
    {

    }

    private void signInPanel_Paint(object sender, PaintEventArgs e)
    {

    }

    private void panel1_Paint(object sender, PaintEventArgs e)
    {

    }

    private async void buttValidRun_Click(object sender, EventArgs e)
    {
        AvailableTruckRuns.Visible = true;

        while (AvailableTruckRuns.Location.X < 200)
        {
            await Task.Delay(1);
            AvailableTruckRuns.Location = new Point(AvailableTruckRuns.Location.X + 5, AvailableTruckRuns.Location.Y);



        }




    }

    private void butt_Click(object sender, EventArgs e)
    {
        AvailableTruckRuns.Visible = false;
    }

    private void button4_Click(object sender, EventArgs e)
    {

    }

    private void ButtMap_Click(object sender, EventArgs e)
    {
        gMapControl1.MapProvider = GMap.NET.MapProviders.GMapProviders.GoogleMap;
        GMap.NET.GMaps.Instance.Mode = GMap.NET.AccessMode.ServerOnly;
    }

}

}