nhibernate.exceptions.genericadoexception错误

Question

这是我的cfg文件：

 <?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
  <session-factory name="NHibernate.Test">
    <property name="connection.driver_class">NHibernate.Driver.SQLite20Driver</property>
    <property name="connection.connection_string">Data Source=nhibernateTest.db;Version=3</property>
    <property name="dialect">NHibernate.Dialect.SQLiteDialect</property>
    <property name="query.substitutions">true=1;false=0</property>
    <property name="show_sql">true</property>
  </session-factory>
</hibernate-configuration>

这是我的hbm文件：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                  assembly="NHExample"
                  namespace="NHExample.Domain">

  <class name="Product" table="Products">
    <id name="Id">
      <generator class="guid" />
    </id>

    <property name="Name" />
    <property name="Category" />
    <property name="Price" />
  </class>

</hibernate-mapping>

这是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NHibernate;
using NHibernate.Cfg;
using System.Reflection;


    namespace NHExample.Domain
    {
        public class Product
        {

            public virtual Guid Id { get; set; }
            public virtual string Name { get; set; }
            public virtual string Category { get; set; }
            public virtual int Price { get; set; }

        }

    class Program
    {
        // Initialize NHibernate
        static Configuration cfg = new Configuration();

        static void Main(string[] args)
        {

            cfg.Configure();
            cfg.AddAssembly(typeof(Product).Assembly);
            ISessionFactory session = cfg.BuildSessionFactory();
            ISession sess = session.OpenSession();

            sess.BeginTransaction();
            Product product = new Product
            {
                Name = "Some C# Book",
                Category = "Books",
                Price = 500,

            };
            sess.Save(product);
         sess.Transaction.Commit();

            IQuery q = sess.CreateQuery("FROM Products");
            var list = q.List<Product>();

            // List all the entries' names
            list.ToList().ForEach(p => Console.WriteLine(p.Name));
        }
    }

} 

我收到错误：

at：sess.Transaction.Commit();

任何想法可能出错？我听说它可以与不存在的数据库连接 - 但数据库是自动创建的，虽然它的重量为0字节......我还需要做些什么才能使其正确？