i'm getting an error

namespace Treehouse.Models
{
    public class VideoGame 
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public string[] Characters { get; set; }
        public string Publisher { get; set; }

        public string DisplayText 
        {
            get
            {
                return Title + "(" + Publisher + ")" ;
            }
        }
    }
}