[nhusers] Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect

[newnhibernateUser]

NHibernate.StaleObjectStateException: Row was updated or deleted by another
transaction (or unsaved-value mapping was incorrect
at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object id,
Object[] fields, Object[] oldFields, Object rowId, Boolean[]
includeProperty, Int32 j, Object oldVersion, Object obj, SqlCommandInfo
sql, ISessionImplementor session)
at
NHibernate.Persister.Entity.AbstractEntityPersister.UpdateOrInsert(Object
id, Object[] fields, Object[] oldFields, Object rowId, Boolean[]
includeProperty, Int32 j, Object oldVersion, Object obj, SqlCommandInfo
sql, ISessionImplementor session)
at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object id,
Object[] fields, Int32[] dirtyFields, Boolean hasDirtyCollection, Object[]
oldFields, Object oldVersion, Object obj, Object rowId, ISessionImplementor
session)
at NHibernate.Action.EntityUpdateAction.Execute()
at NHibernate.Engine.ActionQueue.Execute(IExecutable executable)
at NHibernate.Engine.ActionQueue.ExecuteActions(IList list)
at NHibernate.Engine.ActionQueue.ExecuteActions()
at
NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource
session)
at NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent
event)
at NHibernate.Impl.SessionImpl.Flush()
at NHibernate.Transaction.AdoTransaction.Commit()