Omitting cache usage

Hi,

I'm quite new to Fluent NHibernate. I incorrectly mapped my cache as
HasMany(Of Bond)(Function(f As Fund) f.Bonds).Inverse.Cache.IncludeAll()

i.e. I omitted the method to generate the usage attribute.

I got a very vague runtime error about the configuration being invalid. Because I'm new to this all, it took me ages to track down the problem. I ended up downloading the FH source and debugging it.

I'l like to make two suggestions:
- When the method that generates the usage attribute (.e.g .ReadOnly()) is missing, a clearer exception should be thrown. - At least catch the exception soon enough so that FH can tell me in which Class / ClassMap the problem is. I have loads of classes and maps and took me a long time just to track down the culprit class.