In ComicBookGalleryModel, adding ComicBookArtist class + changes results in numerous build errors - Help plz!

Errors dump:
Severity    Code    Description Project File    Line    Suppression State
Error   CS0053  Inconsistent accessibility: property type 'ICollection<ComicBookArtist>' is less accessible than property 'Artist.ComicBooks'   ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Models\Artist.cs    20  Active
Error   CS0053  Inconsistent accessibility: property type 'ICollection<ComicBookArtist>' is less accessible than property 'ComicBook.Artists'   ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Models\ComicBook.cs 26  Active
Error   CS0051  Inconsistent accessibility: parameter type 'Role' is less accessible than method 'ComicBook.AddArtist(Artist, Role)'    ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Models\ComicBook.cs 36  Active
Error   CS1503  Argument 1: cannot convert from 'ComicBookGalleryModel.Models.Artist' to 'ComicBookGalleryModel.Models.ComicBookArtist' ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Program.cs  55  Active
Error   CS1503  Argument 1: cannot convert from 'ComicBookGalleryModel.Models.Artist' to 'ComicBookGalleryModel.Models.ComicBookArtist' ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Program.cs  56  Active
Error   CS1503  Argument 1: cannot convert from 'ComicBookGalleryModel.Models.Artist' to 'ComicBookGalleryModel.Models.ComicBookArtist' ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Program.cs  64  Active
Error   CS1503  Argument 1: cannot convert from 'ComicBookGalleryModel.Models.Artist' to 'ComicBookGalleryModel.Models.ComicBookArtist' ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Program.cs  65  Active
Error   CS1503  Argument 1: cannot convert from 'ComicBookGalleryModel.Models.Artist' to 'ComicBookGalleryModel.Models.ComicBookArtist' ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Program.cs  73  Active
Error   CS1503  Argument 1: cannot convert from 'ComicBookGalleryModel.Models.Artist' to 'ComicBookGalleryModel.Models.ComicBookArtist' ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Program.cs  74  Active
Error   CS1061  'ComicBookArtist' does not contain a definition for 'Name' and no extension method 'Name' accepting a first argument of type 'ComicBookArtist' could be found (are you missing a using directive or an assembly reference?) ComicBookGalleryModel   C:\Users\kanderson321\documents\visual studio 2017\Projects\ComicBookGalleryModel\ComicBookGalleryModel\Program.cs  88  Active

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComicBookGalleryModel.Models
{
    class ComicBookArtist
    {
        public int Id { get; set; }
        public int ComicBookId { get; set; }
        public int ArtistId { get; set; }
        public int RoleId { get; set; }

        public ComicBook ComicBook { get; set; }
        public Artist Artist { get; set; }
        public Role Role { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComicBookGalleryModel.Models
{
    public class Artist
    {
        public Artist()
        {
            ComicBooks = new List<ComicBookArtist>();
        }

        public int Id { get; set; }
        public string Name { get; set; }

        public ICollection<ComicBookArtist> ComicBooks { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.Entity;

namespace ComicBookGalleryModel.Models
{
    public class ComicBook
    {
        public ComicBook()
        {
            Artists = new List<ComicBookArtist>();
        }

        public int Id { get; set; }
        public int SeriesId { get; set; }
        public int IssueNumber { get; set; }
        public string Description { get; set; }
        public DateTime PublishedOn { get; set; }
        public decimal? AverageRating { get; set;  }

        public Series Series { get; set; }
        public ICollection<ComicBookArtist> Artists { get; set;  }

        public string DisplayText
        {
            get
            {
                return $"{Series?.Title} #{IssueNumber}";
            }
        }

        public void AddArtist(Artist artist, Role role)
        {
            Artists.Add(new ComicBookArtist()
            {
                Artist = artist,
                Role = role
            });
        }
    }
}