illegal access to loading collection

I have this error in the collection CategoryTranslated of class Category: illegal access to loading collection

public class Category : Entity
{

public Category()
{
    CategoriesTranslated = new List<CategoryTranslated>();

}

public virtual Category Parent { get; set; }
public virtual string Name { get; set; }
public virtual IList<CategoryTranslated> CategoriesTranslated { get; set; }

}

public class CategoryTranslated : Entity
{

public CategoryTranslated()
{
}

public virtual Category Category { get; set; }
public virtual LanguageType Language { get; set; }
public virtual string Name { get; set; }

}

public void Override(AutoMapping mapping)

{
    mapping.HasMany(x => x.CategoriesTranslated)
        .Inverse()
        .Cascade.All();

}

public void Override(AutoMapping mapping)

{
    mapping.References(x => x.Category);
}

Where is it wrong? thank you