У меня есть проблема в ASP.NET MVC

---

Error	3	'Newajenci.infra.restrictActionToRollAttribute' does not implement interface member 'System.Web.Mvc.IAuthorizationFilter.OnAuthorization(System.Web.Mvc.AuthorizationContext)'	C:\Users\fatemeh\Documents\Visual Studio 2013\Projects\News\Newajenci\infrustructure\restrictActionToRollAttribute.cs	9	18	Newajenci

Error	4	'Newajenci.Services.NewsAjencyService' does not implement interface member 'Newajenci.Services.Inewsajencyservices.GetAllCategories(Newajenci.Repositoris.INewsrepository)'	C:\Users\fatemeh\Documents\Visual Studio 2013\Projects\News\Newajenci\Services\NewsAjencyService.cs	14	18	Newajenci

Что я уже пробовал:

<pre> public class EFNewsrepository : INewsrepository 
    {
        private newagencycontext context = new newagencycontext();
       public IEnumerable<DAL.DataBase.News> AllAjencinews
        {
            get { return context.Allnews.Include("category"); }
        }
        public IEnumerable<Users> users
        {
            get { return context.users; }
        }
        public IEnumerable<newcategory> categoris
        {
            get { return context.newscategoris; }
        }
        public void savechange()
        {
            context.SaveChanges();

        }
        public void AddNews(News item)
        {
            context.Allnews.Add(item);
        }
        public void AddUsers(Users item)
        {
            context.users.Add(item);
        }
    }

---