System.NullReferenceException

Object reference not set to an instance of an object.

Stack Trace:

at Microsoft.ConfigurationManagement.Migration.ObjectSerialization.Modeling.PrototypeImpl.TryGetPropertyValue(Object instance, String propertyName, Object& value)

at Microsoft.ConfigurationManagement.Migration.ObjectSerialization.Modeling.EntityHandle.TryGetValue[T](String propName, T& value)

at Microsoft.ConfigurationManagement.AdminConsole.MigrationAssistant.ExportPageControl.relatedWoker_DoWork(Object sender, DoWorkEventArgs e)

at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)

at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)

Remove the checkmark “Use an unattended or Sysprep answer file…” from Apply OS step, the export goes fine.

https://social.technet.microsoft.com/Forums/en-US/00b7fc39-f639-48e1-ba07-0604b29e49b1/unable-to-export-task-sequence-with-dependencies-in-sccm-2012-r2-sp1?forum=configmanagerosd