I am upgradding from 2.0.1 to 2.1

I updated the Nhibernate assembly reference and the Iesi.Collections assembly reference to the newer versions.

After doing that and running the solution, it says I needed a proxy factory class. I using NHibernate.ByteCode.Castle's ProxyFactoryFactory.

After setting that up, I am getting a mapping exception.

NHibernate.MappingException : No persister for: System.Int32

at NHibernate.Impl.SessionFactoryImpl.GetEntityPersister(String entityName)
at NHibernate.Type.EntityType.ToLoggableString(Object value, ISessionFactoryImplementor factory)
at NHibernate.Type.AnyType.ToLoggableString(Object value, ISessionFactoryImplementor factory)
at NHibernate.Impl.Printer.ToString(IDictionary`2 namedTypedValues)
at NHibernate.Engine.QueryParameters.LogParameters(ISessionFactoryImplementor factory)
at NHibernate.Engine.Query.HQLQueryPlan.DoIterate(QueryParameters queryParameters, IEventSource session, Nullable`1& isMany, IEnumerable[]& results, IEnumerable& result)
at NHibernate.Engine.Query.HQLQueryPlan.PerformIterate(QueryParameters queryParameters, IEventSource session)
at NHibernate.Engine.Query.HQLQueryPlan.PerformIterate[T](QueryParameters queryParameters, IEventSource session)
at NHibernate.Impl.SessionImpl.Enumerable[T](String query, QueryParameters queryParameters)
at NHibernate.Impl.QueryImpl.Enumerable[T]()
at N2.Persistence.NH.Finder.QueryBuilder.Select[T]() in C:\Users\Paul\Documents\Visual Studio 2008\Projects\N2_Source\src\N2\Persistence\NH\Finder\QueryBuilder.cs:line 362
at N2.Persistence.NH.Finder.QueryBuilder.Select() in C:\Users\Paul\Documents\Visual Studio 2008\Projects\N2_Source\src\N2\Persistence\NH\Finder\QueryBuilder.cs:line 357
at N2.Persistence.VersionManager.GetVersionsOf(ContentItem publishedItem) in C:\Users\Paul\Documents\Visual Studio 2008\Projects\N2_Source\src\N2\Persistence\VersionManager.cs:line 137
at N2.Tests.Persistence.NH.VersionManagerTests.GetVersions_IncludesPublishedVersion_WhenItsTheOnlyVersion() in C:\Users\Paul\Documents\Visual Studio 2008\Projects\N2_Source\src\N2.Tests\Persistence\NH\VersionManagerTests.cs:line 133

This error gets thrown for all the types including DateTime, int, string, etc.

Any help would be appreciated.