Migrate to new version Nhibernate 2.1.0 with Oracle database

A couple of days ago new version of Nhibernate was released. 

And if you migrate to this version and using Oracle database,
You will get this exception

Could not load type NHibernate.Dialect.OracleDialect. Possible cause: no assembly name specified

The reason is, you need specify not OracleDialect, but Oracle8iDialect, Oracle9iDialect, Oracle10gDialect, or OracleLiteDialect instead.
For example for oracle 10.x version you have to change dialect line in your hibernate.cfg.xml to this line

<property name="dialect">NHibernate.Dialect.Oracle10gDialect</property>