Después de unos cambios en el archivo de configuración y de quitar y
poner las dlls de NHibernate, ahora me salta la siguiente excepción

No se controló System.Collections.Generic.KeyNotFoundException
  Message="La clave proporcionada no se encontró en el diccionario."
  Source="mscorlib"
  StackTrace:
       en System.ThrowHelper.ThrowKeyNotFoundException()
       en System.Collections.Generic.Dictionary`2.get_Item(TKey key)
       en NHibernate.Cfg.Configuration.Mapping.GetPersistentClass
(String className)
       en NHibernate.Cfg.Configuration.Mapping.GetIdentifierType
(String className)
       en NHibernate.Type.EntityType.GetIdentifierType(IMapping
factory)
       en NHibernate.Type.EntityType.GetIdentifierOrUniqueKeyType
(IMapping factory)
       en
NHibernate.Persister.Entity.AbstractPropertyMapping.InitIdentifierPropertyPaths
(String path, EntityType etype, String[] columns, IMapping factory)
       en
NHibernate.Persister.Entity.AbstractPropertyMapping.InitPropertyPaths
(String path, IType type, String[] columns, String[] formulaTemplates,
IMapping factory)
       en
NHibernate.Persister.Entity.AbstractEntityPersister.InitOrdinaryPropertyPaths
(IMapping mapping)
       en
NHibernate.Persister.Entity.AbstractEntityPersister.InitPropertyPaths
(IMapping mapping)
       en
NHibernate.Persister.Entity.AbstractEntityPersister.PostConstruct
(IMapping mapping)
       en NHibernate.Persister.Entity.SingleTableEntityPersister..ctor
(PersistentClass persistentClass, ICacheConcurrencyStrategy cache,
ISessionFactoryImplementor factory, IMapping mapping)
       en NHibernate.Persister.PersisterFactory.CreateClassPersister
(PersistentClass model, ICacheConcurrencyStrategy cache,
ISessionFactoryImplementor factory, IMapping cfg)
       en NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg,
IMapping mapping, Settings settings, EventListeners listeners)
       en NHibernate.Cfg.Configuration.BuildSessionFactory()
       en Clases.SessionFactory.Init() en C:\Documents and Settings
\Abel\Mis documentos\Visual Studio 2008\Projects\Proyecto\Clases
\SessionFactory.cs:línea 33
       en Clases.SessionFactory.GetSessionFactory() en C:\Documents
and Settings\Abel\Mis documentos\Visual Studio 2008\Projects\Proyecto
\Clases\SessionFactory.cs:línea 39
       en Clases.SessionFactory.GetNewSession() en C:\Documents and
Settings\Abel\Mis documentos\Visual Studio 2008\Projects\Proyecto
\Clases\SessionFactory.cs:línea 45
       en Clases.UsuarioService.GetTodosUsuarios() en C:\Documents and
Settings\Abel\Mis documentos\Visual Studio 2008\Projects\Proyecto
\Clases\Servicios\UsuarioService.cs:línea 17
       en Aplicacion_escritorio.formInicial.bot_validar_usuario_Click
(Object sender, EventArgs e) en C:\Documents and Settings\Abel\Mis
documentos\Visual Studio 2008\Projects\Aplicacion_escritorio
\Aplicacion_escritorio\PantallaInicial.cs:línea 76
       en System.Windows.Forms.Control.OnClick(EventArgs e)
       en System.Windows.Forms.Button.OnClick(EventArgs e)
       en System.Windows.Forms.Button.PerformClick()
       en System.Windows.Forms.Form.ProcessDialogKey(Keys keyData)
       en System.Windows.Forms.Control.ProcessDialogKey(Keys keyData)
       en System.Windows.Forms.Control.PreProcessMessage(Message& msg)
       en System.Windows.Forms.Control.PreProcessControlMessageInternal
(Control target, Message& msg)
       en
System.Windows.Forms.Application.ThreadContext.PreTranslateMessage
(MSG& msg)
       en
System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FPreTranslateMessage
(MSG& msg)
       en
System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop
(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       en
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner
(Int32 reason, ApplicationContext context)
       en System.Windows.Forms.Application.ThreadContext.RunMessageLoop
(Int32 reason, ApplicationContext context)
       en System.Windows.Forms.Application.Run(Form mainForm)
       en Aplicacion_escritorio.Program.Main() en C:\Documents and
Settings\Abel\Mis documentos\Visual Studio 2008\Projects
\Aplicacion_escritorio\Aplicacion_escritorio\Program.cs:línea 18
       en System.AppDomain._nExecuteAssembly(Assembly assembly, String
[] args)
       en System.AppDomain.ExecuteAssembly(String assemblyFile,
Evidence assemblySecurity, String[] args)
       en
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       en System.Threading.ThreadHelper.ThreadStart_Context(Object
state)
       en System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
       en System.Threading.ThreadHelper.ThreadStart()
  InnerException:


Mi archivo de configuración

<?xml version="1.0"?>
<configuration>
    <configSections>
      <section name="hibernate-configuration"
type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate"/>
        <sectionGroup name="applicationSettings"
type="System.Configuration.ApplicationSettingsGroup, System,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
            <section name="Aplicacion_escritorio.Properties.Settings"
type="System.Configuration.ClientSettingsSection, System,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
requirePermission="false"/>
        </sectionGroup>

    </configSections>

  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>
      <!--
      <property name="format_sql">true</property>
      <property name="prepare_sql">true</property>-->
      <property name="connection.provider">
        NHibernate.Connection.DriverConnectionProvider
      </property>
      <property name="dialect">
        <!-- NHibernate.Dialect.MsSql2005Dialect -->
        NHibernate.Dialect.PostgreSQLDialect
      </property>
      <property name="connection.driver_class">
        <!-- NHibernate.Driver.SqlClientDriver -->
        NHibernate.Driver.OdbcDriver
      </property>
      <property name="connection.connection_string">
        <!-- Data Source=.\SQLEXPRESS;
        AttachDbFilename=|DataDirectory|\Tutorial.mdf;
        Integrated Security=True;
        User Instance=True -->
 
Dsn=PostgreSQL30;database=central;server=localhost;port=5432;uid=postgres;pass=admin;sslmode=disable;readonly=0;protocol=7.4-1;fakeoidindex=0;showoidcolumn=0;rowversioning=0;showsystemtables=0;fetch=100;socket=4096;unknownsizes=0;maxvarcharsize=255;maxlongvarcharsize=8190;debug=0;commlog=0;optimizer=1;ksqo=1;usedeclarefetch=1;textaslongvarchar=1;unknownsaslongvarchar=0;boolsaschar=1;parse=0;cancelasfreestmt=1;extrasystableprefixes=dd_;lfconversion=1;updatablecursors=1;disallowpremature=0;trueisminus1=0;bi=0;byteaaslongvarbinary=0;useserversideprepare=0;lowercaseidentifier=1;xaopt=1

      </property>
      <property name="show_sql">
        true
      </property>
      <property
name="proxyfactory.factory_class">NHibernate.ByteCode.LinFu.ProxyFactoryFactory,
NHibernate.ByteCode.LinFu</property>

      <!--
      <property name="proxyfactory.factory_class">
        NHibernate.ByteCode.Castle.ProxyFactoryFactory,
NHibernate.ByteCode.Castle
      </property>
      -->
    </session-factory>
  </hibernate-configuration>

    <connectionStrings>
        <add
name="Aplicacion_escritorio.Properties.Settings.ConnectionString"
connectionString="Dsn=PostgreSQL30;uid=postgres;pwd=admin"
providerName="System.Data.Odbc"/>
    </connectionStrings>
  <runtime>
    <!--<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
                        <dependentAssembly>
                                <assemblyIdentity name="NHibernate"
publicKeyToken="AA95F207798DFDB4" culture="neutral"/>
                                <bindingRedirect oldVersion="0.0.0.0-2.1.0.4000"
newVersion="2.1.0.4000"/>
                        </dependentAssembly>
                        <dependentAssembly>
                                <assemblyIdentity name="Castle.Core"
publicKeyToken="407DD0808D44FBDC" culture="neutral"/>
                                <bindingRedirect oldVersion="0.0.0.0-1.1.0.0" 
newVersion="1.1.0.0"/
>
        <bindingRedirect oldVersion="0.0.0.0-1.1.0.0"
newVersion="2.1.0.4000"></bindingRedirect>
                        </dependentAssembly>
                </assemblyBinding>
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
                        <dependentAssembly>
                                <assemblyIdentity name="Castle.Core"
publicKeyToken="407DD0808D44FBDC" culture="neutral"/>
                                <bindingRedirect oldVersion="0.0.0.0-1.1.0.0" 
newVersion="1.0.3.0"/
>
                        </dependentAssembly>
                </assemblyBinding>-->
  </runtime>
</configuration>

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Para escribir al Grupo, hágalo a esta dirección: 
[email protected]
Para más, visite: http://groups.google.com/group/NHibernate-Hispano
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