Mapping of classes and sub classes by fluent nhibernate

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NHibernate

MVC4

Fluent

mapping

hi friends,

I am getting problem while mapping my model class(with subclasses).
I am not getting the Name. It shows error while writing the code.
The error is "CatsTute' does not contain a definition for 'Name' and no extension method 'Name' accepting a first argument of type 'CatsTute' could be found (are you missing a using directive or an assembly reference?)":
Here is main model (CatsTutes):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using codes.Models.BaseModel;

namespace codes.Models
{
    public class CatsTute:ModelBase
    {
        public class Category:ModelBase
        {
            public virtual string Name { get; set; }
            public virtual string Image { get; set; }
        }
        public class SubCat:ModelBase
        {
            public virtual int CatId { get; set; }
            public virtual string Name { get; set; }
            public virtual string Image { get; set; }
        }
        public class Tutorial:ModelBase
        {
            public virtual string Name { get; set; }
            public virtual string Description { get; set; }
            public virtual int SubCatId { get; set; }
        }
    }
}

This is base model(ModelBase):-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace codes.Models.BaseModel
{
    public class ModelBase
    {
        public virtual int Id { get; set; }
        public virtual DateTime CreatedOn { get; set; }
        public virtual DateTime UpdatedOn { get; set; }
        public virtual int Deleted { get; set; }
        public virtual bool Status { get; set; }
    }
}

Here is mapping class(AllMapping):-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using FluentNHibernate.Mapping;

namespace codes.Models.Mapping
{
    public class AllMappings : ClassMap<CatsTute>
    {
        public AllMappings()
        {
            Table("CatsTute");
            Id(x => x.Id, "Id").GeneratedBy.Identity().UnsavedValue(0);
            Map(x => x.Status);
            Map(x => x.CreatedOn);
            Map(x => x.UpdatedOn);
            Map(x => x.Deleted);
            Map(x => x.Name).CustomSqlType("nvarchar(50)");   <========Here is the problem
            DynamicUpdate();
        }
    }
}

What I have tried:

I don't know what to do............