The string is not a valid AllXsd value

[bastan]

Hi experts,

I try to migrate an azure DevOps Project from one organisation to another one!

During copying one item I get the following error message:

[10:09:13 ERR] System.FormatException: Die Zeichenfolge 'Microsoft.TeamFoundation.WorkItemTracking.Common.ServerDefaultFieldValue' kein gültiger AllXsd-Wert.
   bei System.Xml.Schema.XsdDateTime..ctor(String text, XsdDateTimeFlags kinds)
   bei System.Xml.XmlConvert.ToDateTime(String s, XmlDateTimeSerializationMode dateTimeOption)
   bei Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemFieldData.ConvertFromXml(String value, Type type)
   bei Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemFieldData.TakeUpdateResult(XmlElement result, Int32 newRev)
   bei Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItem.TakeUpdateResult(XmlElement result)
   bei Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemStore.SaveWorkItems(WorkItem[] workitems, Boolean bulk, SaveFlags saveFlags)
   bei Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItem.Save(SaveFlags saveFlags)
   bei MigrationTools.TfsExtensions.SaveToAzureDevOps(WorkItemData context) in D:\a\1\s\src\MigrationTools.Clients.AzureDevops.ObjectModel\TfsExtensions.cs:Zeile 77.
   bei VstsSyncMigrator.Engine.WorkItemMigrationContext.ReplayRevisions(List`1 revisionsToMigrate, WorkItemData sourceWorkItem, WorkItemData targetWorkItem) in D:\a\1\s\src\VstsSyncMigrator.Core\Execution\MigrationContext\WorkItemMigrationContext.cs:Zeile 692.

So If I t take a look in the logs I found this step:
...
[10:09:13 INF] [ Feature][Complete: 99/3650][sid: 20295|Rev: 9][tid: null | System.RevisedDate (Revised Date) | 01/01/9999
..
As I understood based on this post this format of date time cuase the problem.

But for me as a user what would be the solution? I have installed this beautiful tool three/four month ago and I thought this bug is solved !
Any Idea?

[MrHinsh]

Your best bet would be to debug in Visual Studio. This is generally the only way to find and diagnose data issues.