[nhibernate-development] Problem trying to set property type by reflection

[niberhate]

I am playing with the HelloNHibernate example of NHibernate In
Action.  The source code can be downloaded from
http://www.manning.com/kuate/NHibernateInAction.Source.zip

You will find an example solution called "1. Simple Example - Helllo
NHibernate" in that zip package.

Because the objective of that example is to have the minimum working
solution of NHibernate, it has public fields instead of private. The
fields are Id, Name and Manager (I use PascalStyle for naming
convention, so I capitalized the initial characters of these fields.)

So, I changed the public fields into public auto properties, and then
the following method throws and exception at c.AddAssembly
(Assembly.GetCallingAssembly());

   static ISession OpenSession()
        {
            if (factory == null)
            {
                Configuration c = new Configuration();
                c.AddAssembly(Assembly.GetCallingAssembly());
                factory = c.BuildSessionFactory();
            }
            return factory.OpenSession();
        }

The exception says:

{"Could not compile the mapping document:
HelloNHibernate.HelloNHibernate.Employee.hbm.xml"}

And the inner exception says:

{"Problem trying to set property type by reflection"}

In other words, everything else being the same, the following works:

namespace HelloNHibernate
{
    class Employee
    {
        public int Id;
        public string Name;
        public Employee Manager;

        public string SayHello()
        {
            return string.Format(
            "'Hello World!', said {0}.", Name);
        }
    }
}


Whereas the following fails:

namespace HelloNHibernate
{
    class Employee
    {
        public int Id { get; private set; }
        public string Name { get; set; }
        public Employee Manager { get; set; }

        public string SayHello()
        {
            return string.Format(
            "'Hello World!', said {0}.", Name);
        }
    }
}

What is the caveat? Does NHibernate have any special configuration
requirement for auto properties to work?  Any idea? Thanks.