SharePoint 2007, Content Deployment ''User cannot be found' error

I am tring to run a job but it gets Failed for tow below errors:

1-User cannot be found. at Microsoft.SharePoint.SPUserCollection.GetByID(Int32 id) at Microsoft.SharePoint.SPWeb.get_Author() at Microsoft.SharePoint.Deployment.WebSerializer.GetDataFromObjectModel(Object obj, SerializationInfo info, StreamingContext context) at Microsoft.SharePoint.Deployment.DeploymentSerializationSurrogate.GetObjectData(Object obj, SerializationInfo info, StreamingContext context) at Microsoft.SharePoint.Deployment.XmlFormatter.SerializeObject(Object obj, ISerializationSurrogate surrogate, String elementName, Boolean bNeedEnvelope) at Microsoft.SharePoint.Deployment.XmlFormatter.Serialize(Stream serializationStream, Object topLevelObject) at Microsoft.SharePoint.Deployment.ObjectSerializer.Serialize(DeploymentObject deployObject, Stream serializationStream) at Microsoft.SharePoint.Deployment.SPExport.SerializeObjects() at Microsoft.SharePoint.Deployment.SPExport.Run()

2-Content deployment job 'test_test' failed.The exception thrown was 'Microsoft.SharePoint.SPException' : 'User cannot be found.'

what can i do?

-it is an issue i posed it before in The official blog of the SharePoint Product Group-Content Deployment, it is really useful.

http://blogs.msdn.com/sharepoint/archive/2006/05/02/588140.aspx