MappingException: No persister for - NHibernate -

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NHibernate.MappingException: No persister for: XYZ 15 answers

Well, I googled a lot, and found the same advices all there (set hbm as Embedded Resource, add hbm at hibernate.cfg, etc..), and despite of them, I still not get it.

Let me explain: I wrote a Communication Dll for a ticket gate device, and there I have a configuration model class, that I use to configure that device through TCP/IP. But now, I have to persist this object on DB, so I wrote an Adapter inside my model which glues one into another. This way, I have an Adapter for my configuration model that have an ID, IncludedDate and so on. Let's see:

DeviceConf Model class:

public class DeviceConf : BaseModel // which have ID, IncludedDate, etc
{
    private TGCommHelper.Entities.Configuration.TicketGateConfig _conf;

    public TGCommHelper.Entities.Configuration.TicketGateConfig conf
    {
        get { return _conf; }
        private set { _conf = value; }
    }
    public DeviceConf()
    {
        conf = new TGCommHelper.Entities.Configuration.TicketGateConfig();
    }
    public DeviceConf(TGCommHelper.Entities.Configuration.TicketGateConfig config){
        conf = config;
    }

    public virtual string IP
    {
        get { return conf.IP; }
        set { conf.IP = value; }
    }

    public virtual string MAC_ADDR
    {
        get { return conf.MAC_ADDR; }
        set { conf.MAC_ADDR = value; }
    }

//... and so on.
}

DeviceConf.hbm.xml Mapping file:

    < hibernate-mapping assembly="TGPass.Model" namespace="TGPass.Model"
xmlns="urn:nhibernate-mapping-2.2">
    < class name="DeviceConf" table="DeviceConfTbl">
        < id name="ID" column="ID">
            < generator class="identity" />
        < /id>
        < property name="IP">
            < column name="IP" sql-type="varchar" not-null="true" />
        < /property>
        < property name="MAC_ADDR">
            < column name="MAC_ADDR" sql-type="varchar" not-null="true" />
        < /property>
        < !-- and so on -->
    < /class>
< /hibernate-mapping>

Save Method:

public virtual void Create(T saveObj)
{
    using (var session = GetSession())
    {
        using (var trans = session.BeginTransaction())
        {
            try
            {
                session.Save(saveObj);
                trans.Commit();
            }
            catch (Exception e)
            {

                throw e;
            }
        }
    }
}

With another model classes I have here, all things work nicely, but not with this one. Every time I try to save this with Create method, NHibernate raises a MappingException with "No persister for TGPass.Model.DeviceConf"...

Where I'm doing it wrong?

Thank you in advance.

Just for completeness (also based on my painful experience), there are mostly three reasons of this exception:

xml mapping file is NOT makred as Embedded Resource
xml file is not part of .dll which is configured as the mapping source <mapping assembly="MyProject.Data" /> (see <session-factory> configuration)
xml file does not have the default suffix .hbm.xml

One of these is usually the culprit of the: MappingException: No persister for...