Hi Guys,
I am getting this exception when i have an abstract class that i am
trieng to query. what can be the problem?

This is my mapping XML

- <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-
access="property" auto-import="true" default-cascade="none" default-
lazy="true">
- <class xmlns="urn:nhibernate-mapping-2.2" mutable="true"
name="Promo.NH.Model.Entity, Promo.NH, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=null" table="tbl_Entity">
- <id name="Id" type="System.Int32, mscorlib, Version=4.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089" unsaved-value="0">
  <column name="Id" />
  <generator class="identity" />
  </id>
- <property name="CreatedDate" type="System.DateTime, mscorlib,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
  <column name="CreatedDate" />
  </property>
- <property name="UpdatedDate" type="System.DateTime, mscorlib,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
  <column name="UpdatedDate" />
  </property>
- <joined-subclass name="Promo.NH.Model.EntityTemplate, Promo.NH,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_EntityTemplate">
- <key>
  <column name="Entity_id" />
  </key>
- <joined-subclass name="Promo.NH.Model.AttributeTemplate, Promo.NH,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_AttributeTemplate">
- <key>
  <column name="EntityTemplate_id" />
  </key>
- <property name="Title" type="System.String, mscorlib,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
  <column name="Title" />
  </property>
- <property name="CodeName" type="System.String, mscorlib,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
  <column name="CodeName" />
  </property>
- <property name="Descriptor" type="System.Boolean, mscorlib,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
  <column name="Descriptor" />
  </property>
- <joined-subclass name="Promo.NH.Model.AttributeTemplates.ATHtml,
Promo.NH, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_ATHtml">
- <key>
  <column name="AttributeTemplate_id" />
  </key>
  </joined-subclass>
- <joined-subclass name="Promo.NH.Model.AttributeTemplates.ATImage,
Promo.NH, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_ATImage">
- <key>
  <column name="AttributeTemplate_id" />
  </key>
  </joined-subclass>
- <joined-subclass
name="Promo.Core.MetaModel.AttributeTemplates.ATLocation, Promo.NH,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_ATLocation">
- <key>
  <column name="AttributeTemplate_id" />
  </key>
  </joined-subclass>
- <joined-subclass name="Promo.NH.Model.AttributeTemplates.ATPassword,
Promo.NH, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_ATPassword">
- <key>
  <column name="AttributeTemplate_id" />
  </key>
  </joined-subclass>
- <joined-subclass
name="Promo.NH.Model.AttributeTemplates.ATPhoneNumber, Promo.NH,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_ATPhoneNumber">
- <key>
  <column name="AttributeTemplate_id" />
  </key>
  </joined-subclass>
- <joined-subclass
name="Promo.NH.Model.AttributeTemplates.ATSingleLineText, Promo.NH,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="tbl_ATSingleLineText">
- <key>
  <column name="AttributeTemplate_id" />
  </key>
  </joined-subclass>
  </joined-subclass>
  </joined-subclass>
  </class>
  </hibernate-mapping>

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