Aqui les mando el error, a ver si me pueden ayudar

No se controló NHibernate.MappingException
  Message="Could not compile the mapping document:
Eg.Core.Product.hbm.xml"
  Source="NHibernate"
  StackTrace:
       en NHibernate.Cfg.Configuration.LogAndThrow(Exception
exception)
       en
NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument
doc)
       en NHibernate.Cfg.Configuration.ProcessMappingsQueue()
       en
NHibernate.Cfg.Configuration.AddDocumentThroughQueue(NamedXmlDocument
document)
       en NHibernate.Cfg.Configuration.AddXmlReader(XmlReader
hbmReader, String name)
       en NHibernate.Cfg.Configuration.AddInputStream(Stream
xmlInputStream, String name)
       en NHibernate.Cfg.Configuration.AddResource(String path,
Assembly assembly)
       en NHibernate.Cfg.Configuration.AddAssembly(Assembly assembly)
       en NHibernate.Cfg.Configuration.AddAssembly(String
assemblyName)
       en
NHibernate.Cfg.Configuration.DoConfigure(IHibernateConfiguration hc)
       en NHibernate.Cfg.Configuration.Configure(XmlReader textReader)
       en NHibernate.Cfg.Configuration.Configure(String fileName,
Boolean ignoreSessionFactoryConfig)
       en NHibernate.Cfg.Configuration.Configure(String fileName)
       en ConfigByAppConfig.Program.Main(String[] args) en C:
\Documents and Settings\augusto.ferriz\Mis documentos\Visual Studio
2008\Projects\Cookbook\ConfigByAppConfig\Program.cs:línea 14
       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: NHibernate.MappingException
       Message="Problem trying to set property type by reflection"
       Source="NHibernate"
       StackTrace:
            en
NHibernate.Mapping.SimpleValue.SetTypeUsingReflection(String
className, String propertyName, String accesorName)
            en
NHibernate.Cfg.XmlHbmBinding.ClassBinder.CreateProperty(IValue value,
String propertyName, String className, XmlNode subnode, IDictionary`2
inheritedMetas)
            en
NHibernate.Cfg.XmlHbmBinding.ClassBinder.PropertiesFromXML(XmlNode
node, PersistentClass model, IDictionary`2 inheritedMetas, UniqueKey
uniqueKey, Boolean mutable, Boolean nullable, Boolean naturalId)
            en
NHibernate.Cfg.XmlHbmBinding.ClassBinder.PropertiesFromXML(XmlNode
node, PersistentClass model, IDictionary`2 inheritedMetas)
            en
NHibernate.Cfg.XmlHbmBinding.RootClassBinder.Bind(XmlNode node,
HbmClass classSchema, IDictionary`2 inheritedMetas)
            en
NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.AddRootClasses(XmlNode
parentNode, IDictionary`2 inheritedMetas)
            en
NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.Bind(XmlNode node)
            en
NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument
doc)
       InnerException: NHibernate.MappingException
            Message="class Eg.Core.Product, Eg.Core, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=null not found while looking for
property: Descripcion"
            Source="NHibernate"
            StackTrace:
                 en
NHibernate.Util.ReflectHelper.ReflectedPropertyClass(String className,
String name, String accessorName)
                 en
NHibernate.Mapping.SimpleValue.SetTypeUsingReflection(String
className, String propertyName, String accesorName)
            InnerException: NHibernate.PropertyNotFoundException
                 Message="Could not find a getter for property
'Descripcion' in class 'Eg.Core.Product'"
                 Source="NHibernate"
                 AccessorType="getter"
                 PropertyName="Descripcion"
                 StackTrace:
                      en
NHibernate.Properties.BasicPropertyAccessor.GetGetter(Type type,
String propertyName)
                      en NHibernate.Util.ReflectHelper.GetGetter(Type
theClass, String propertyName, String propertyAccessorName)
                      en
NHibernate.Util.ReflectHelper.ReflectedPropertyClass(String className,
String name, String accessorName)
                 InnerException:

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