Could not compile the mapping document: WindowsFormsApplication1.Customers.hbm.xml in nhibernate

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C#

WinForms

NHibernate

my configuration file is

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />
  </configSections>
  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>
      <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
      <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
      <property name="connection.connection_string">Data Source=SERVER\SQLSERVER2088R2;Initial Catalog=Northwind;Persist Security Info=True;User ID=sa;Password=mysystem;</property>
      <property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
      <property name="show_sql">false</property>
      <property name='proxyfactory.factory_class'>NHibernate.ByteCode.LinFu.ProxyFactoryFactory, NHibernate.ByteCode.LinFu</property>
    </session-factory>
  </hibernate-configuration>
</configuration>

and my mappinfile is

<?xml version="1.0" encoding="utf-8"?>
<hibernate-mapping assembly="Sample.CustomerService.Domain" namespace="Sample.CustomerService.Domain" xmlns="urn:nhibernate-mapping-2.2">
  <class name="Customers" table="Customers"  >
    <id name="Customerid" column="CustomerID" />
    <property name="Companyname">
      <column name="CompanyName" sql-type="nvarchar" not-null="true" />
    </property>
    <property name="Contactname">
      <column name="ContactName" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="Contacttitle">
      <column name="ContactTitle" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="Address">
      <column name="Address" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="City">
      <column name="City" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="Region">
      <column name="Region" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="Postalcode">
      <column name="PostalCode" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="Country">
      <column name="Country" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="Phone">
      <column name="Phone" sql-type="nvarchar" not-null="false" />
    </property>
    <property name="Fax">
      <column name="Fax" sql-type="nvarchar" not-null="false" />
    </property>
    <bag name="Customercustomerdemo">
      <key column="CustomerID" />
      <one-to-many class="Customercustomerdemo" />
    </bag>
    <bag name="Orders">
      <key column="CustomerID" />
      <one-to-many class="Orders" />
    </bag>
  </class>
</hibernate-mapping>

and class for this mapping is

using System;
using System.Text;
using System.Collections.Generic;


namespace Sample.CustomerService.Domain {

    public class Customers
    {
        public Customers() { }
        public virtual string Customerid { get; set; }
        public virtual string Companyname { get; set; }
        public virtual string Contactname { get; set; }
        public virtual string Contacttitle { get; set; }
        public virtual string Address { get; set; }
        public virtual string City { get; set; }
        public virtual string Region { get; set; }
        public virtual string Postalcode { get; set; }
        public virtual string Country { get; set; }
        public virtual string Phone { get; set; }
        public virtual string Fax { get; set; }
    }
}

and session factory is

public sealed class SessionFactory
   {
       private static volatile ISessionFactory iSessionFactory;
       private static object syncRoot = new Object();

       public static ISession OpenSession
       {
           get
           {
               if (iSessionFactory == null)
               {
                   lock (syncRoot)
                   {
                       if (iSessionFactory == null)
                       {
                           Configuration configuration = new Configuration();
                           configuration.AddAssembly(Assembly.GetCallingAssembly());
                           iSessionFactory = configuration.BuildSessionFactory();
                       }
                   }
               }
               return iSessionFactory.OpenSession();
           }
       }
   }

i am calling this by

using (ISession session = SessionFactory.OpenSession)
            {
                IQuery query = session.CreateQuery("FROM Customers");
                IList<Customers> pInfos = query.List<Customers>();
                dgView.DataSource = pInfos;
            }

always giving errors mapping document cant compile ,help me please , i am new to nhibernate.
i downloaded nhibernate by visual studio option manage nuggets ,it added two dlls ,one is nhibernate other is Iesi.collections,
i dont think i need dlls like somewhat(bytecod.linfu ,or castle.dll) etc.