Erro no mapeamento

Bom dia, estou fazendo um teste no nhibernate ocorreu o seguinte erro não estou achando a solução alguém poderia me ajudar?

o erro:
Ambiguous mapping tag in configuration assembly= resource=mapeamentos/Teste.hbm.xml file=;There are 3 possible combinations of mapping attributes
1 - resource & assembly: NHibernate will read the mapping resource from the specified assembly
2 - file only: NHibernate will read the mapping from the file.
3 - assembly only: NHibernate will find all the resources ending in hbm.xml from the assembly.

<?xml version="1.0" encoding="UTF-8"?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
  <session-factory>
    <property name="connection.driver_class">NHibernate.Driver.FirebirdClientDriver</property>    
    <property name="connection.connection_string"> Server=localhost; Database=C:\a\nHibernate\teste.fdb; User=SYSDBA;Password=masterkey </property>
    <property name="show_sql">false</property>    
    <property name="command_timeout">60</property>
    <property name="query.substitutions">true 1, false 0, yes 1, no 0</property>
    <property name="dialect">NHibernate.Dialect.FirebirdDialect</property>


    <mapping resource="mapeamentos/Teste.hbm.xml"/>
  </session-factory>             
</hibernate-configuration>
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="classes/Teste" table ="teste">
    <id name="Codigo" column="codigo" type="integer" unsaved-value="null">
            <generator class="native">
                <param name="sequence">GEN_TESTE_ID</param>
             </generator>
    </id>              
    <property name="nome" column ="nome" />    
  </class>
</hibernate-mapping>

Obrigado.

Resolvido!