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NHibernate.MappingException: No persister for: Sample.Product

After creating a new mapping file using the code mapping feature in NHibernate, it didn’t work when I tried to persist an instance of the object. Instead I got the following error message:

NHibernate.MappingException: No persister for: Sample.Product

Here is the mapping file I’m using:

Do you notice what’s wrong? ….

I forgot to make my mapping class public:

public class ProductMapping: ClassMapping<Product>

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