Nhibernate vb.net mvc failed to compile mapping

I am new to NhIbernate and Vb.net MVC, I am trying to do this tutorial. I am using VS 2013

http://www.dotnetjalps.com/2013/09/asp-net-mvc-nhibernate-crud-getting-started.html

But using Vb.net instead of C # My current config is such that

I am getting an exception like this:

{"Could not compile the mapping document: d:\documenti\visual studio 2013\Projects\NhibernateMVC\NhibernateMVC\Models\Nhibernate\Employee.hbm.xml"}

{"persistent class NhibernateMVC.Models.Employee, NhibernateMVC not found"}

{"Impossibile caricare il tipo 'NhibernateMVC.Models.Employee' dall'assembly 'NhibernateMVC, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.":"NhibernateMVC.Models.Employee"}

      

        
        
        
      

    

This is my Employee.vb class

Namespace NhibernateMVC.Models
    Public Class Employee

        Public _Id As Integer = 0
        Public _FirstName As String = ""
        Public _LastName As String = ""
        Public _Designation As String = ""

        Public Overridable Property Id() As Integer
            Get
                Return _Id
            End Get
            Set(ByVal Value As Integer)
                _Id = Value
            End Set
        End Property

        Public Overridable Property FirstName() As String
            Get
                Return _FirstName
            End Get
            Set(ByVal Value As String)
                _FirstName = Value
            End Set
        End Property

        Public Overridable Property LastName() As String
            Get
                Return _LastName
            End Get
            Set(ByVal Value As String)
                _LastName = Value
            End Set
        End Property

        Public Overridable Property Designation() As String
            Get
                Return _Designation
            End Get
            Set(ByVal Value As String)
                _Designation = Value
            End Set
        End Property

    End Class
End Namespace

      

        
        
        
      

    

This is my Employee.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
    <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" auto-import="true" assembly="NhibernateMVC" namespace="NhibernateMVC.Models">
      <class name="Employee" table="Employee" dynamic-update="true" >
        <cache usage="read-write"/>
        <id name="Id" column="Id" type="int">
          <generator class="native" />
        </id>
        <property name="FirstName" />
        <property name="LastName" />
        <property name="Designation" />
      </class>
</hibernate-mapping>

      

        
        
        
      

    

And this one, NHIbernateSession.vb

Imports System.Web
Imports NHibernate
Imports NHibernate.Cfg

Namespace NhibernateMVC.Models

    Public Class NHibertnateSession
        Public Shared Function OpenSession() As ISession
            Dim configuration As New Configuration()

            Dim configurationPath = HttpContext.Current.Server.MapPath("~\Models\Nhibernate\hibernate.cfg.xml")
            Dim employeeConfigurationFile = HttpContext.Current.Server.MapPath("~\Models\Nhibernate\Employee.hbm.xml")

            configuration.Configure(configurationPath)

            configuration.AddFile(employeeConfigurationFile)
            Dim sessionFactory = configuration.BuildSessionFactory()

            Return sessionFactory.OpenSession()
        End Function
    End Class
End Namespace