The non-generic method 'dictionary<type, type>.add(type, type)' cannot be used with type arguments

See more:

C#

.NET

repository

Hi,
I have below classes and interface implementation

public interface IPageRepository<T> : IRepository
 {
        IList<T> GetPage(Criteria criteria, out int totalRows);
 }

public interface ICategoryRepository : IPageRepository<Category>
    {
 // rest of the methods
}

public class CategoryRepository : BaseDap, ICategoryRepository
{
   // method implementations
}

public class RepositoryFactory
{
        private static readonly Dictionary<Type, Type> container = new Dictionary<Type, Type>();

        static RepositoryFactory()
        {
	     container.Add<ICategoryRepository, CategoryRepository>();  
		// Getting error here:
		//The non-generic method 'Dictionary<Type, Type>.Add(Type, Type)' 
                //   cannot be used with type arguments
        }
}

What I have tried:

I have followed similar pattern in other project and it works there. What am I missing here?