BuildSessionFactory()出错

[sqlite_me]

调用cfg.BuildSessionFactory()抛出异常，
这个信息太大了，谁能给点指示！！
Source：NHibernate
Message：
The following types may not be used as proxies:
ImageDatabase.PersistentImage: type should have a visible (public or protected) no-argument constructor
ImageDatabase.PersistentImage: method get_XmlImage should be 'public/protected virtual' or 'protected internal virtual'
ImageDatabase.PersistentImage: method set_XmlImage should be 'public/protected virtual' or 'protected internal virtual'
ImageDatabase.PersistentImage: method Action should be 'public/protected virtual' or 'protected internal virtual'
ImageDatabase.PersistentImage: method Convert should be 'public/protected virtual' or 'protected internal virtual'
ImageDatabase.PersistentImage: method SmoothBlur should be 'public/protected virtual' or 'protected internal virtual'
ImageDatabase.PersistentImage: method SmoothMedian should be 'public/protected virtual' or 'protected internal virtual'
ImageDatabase.PersistentImage: method SmoothBilatral should be 'public/protected virtual' or 'protected internal virtual'
ImageDatabase.PersistentImage: method SmoothGaussian should be 'public/protected virtual' or 'protected internal virtual'
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[sqlite_me]

没一个人看看吗，郁闷、