NHibernate配置问题

Could not add assembly test



<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2" >
<session-factory name="NHibernate.Test">
<!-- properties -->
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
<property name="connection.connection_string">server=.;uid=sa;pwd=123456;database=demoTest</property>
<property name="show_sql">false</property>
<property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property>
<property name="use_outer_join">true</property>
<!-- mapping files -->
<mapping assembly="test" />
</session-factory>
</hibernate-configuration>



有什么错呢.... <session-factory name="NHibernate.Test">是什么意思呢
.....郁闷..老是配不好.