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Q: 

Null Reference exception in NHibernate.Linq AssociationVisitor constructor

I keep encountering the following error when using NHibernate.Linq

System.NullReferenceException: Object reference not set to an instance of an object. at NHibernate.Linq.Visitors.AssociationVisitor..ctor(ISessionFactoryImplementor sessionFactory) at NHibernate.Linq.NHibernateQueryProvider.TranslateExpression(Expression expression) at NHibernate.Linq.NHibernateQueryProvider.Execute(Expression expression) at NHibernate.Linq.QueryProvider.System.Linq.IQueryProvider.Execute(Expression expression) at System.Linq.Queryable.FirstOrDefault(IQueryable1 source, Expression1 predicate)

Does anyone have any idea why this may be occurring even for the most basic queries?

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