Nhibernate Validator

In my unit tests I am getting an error when I am debugging. The weird thing is I do not get this whenever I just run the test (it's only when debugging a test). I get an exception whenever I try to validate one of my entities with NHibernate Validator. The following line throws the exception below.

InvalidValue[] invalidValues = validatorEngine.Validate(group);

Exception: The ProxyFactoryFactory was not configured. Initialize 'proxyfactory.factory_class' property of the session-factory configuration section with one of the available NHibernate.ByteCode providers. Example: NHibernate.ByteCode.LinFu.ProxyFactoryFactory, NHibernate.ByteCode.LinFu Example: NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle

I'm configuring the validator engine like this:

var nhvConfiguration = new FluentConfiguration();
        nhvConfiguration
           .SetDefaultValidatorMode(ValidatorMode.OverrideAttributeWithExternal)
           .Register(Assembly.Load("Business.Objects")
           .ValidationDefinitions());

        validatorEngine = new ValidatorEngine();
        validatorEngine.Configure(nhvConfiguration);

I'm not sure what's going on here. Anyone know why I am getting this error while debugging and not while just running the test?

I'm using NHibernate 3.1 and NHibernate validator 1.3

The reason it was throwing this exception was unrelated to any nhibernate configuration. The following post explains why I was getting this exception.

C# Uncaught exception in unit test