[错误][完成：55/837][sid:16308 |Rev:15][tid:null | 在 Work item:16308 上找到 15 个要迁移的修订
[错误][完成：55/837][sid:16308 |Rev:15][tid:null | ...未能保存 [错误][完成：55/837][sid:16308 |Rev:15][tid:null | Microsoft.TeamFoundation.TeamFoundationServiceUnavailableException：HTTP 代码 503：服务不可用 ---> System.Net.WebException：远程服务器返回错误：（503）服务器不可用。在 System.Net.HttpWebRequest.GetResponse() 在 Microsoft.TeamFoundation.Client.Channels.TfsHttpWebRequest.SendRequestAndGetResponse(HttpWebRequest webRequest, WebException& webException) --- 内部异常堆栈跟踪结束 --- 在 Microsoft.TeamFoundation.Client.Channels。 TfsHttpWebRequest.ReadResponse(HttpWebResponse webResponse, WebException webException) 在 Microsoft.TeamFoundation.Client.Channels.TfsHttpWebRequest.IsAuthenticationChallenge(TfsMessage requestMessage,1 asOfDate, Boolean useMaster, RowSetCollection& workItem, MetadataTableHaveEntry[] metadataHave, String& dbStamp, RowSetCollection& metadata) at Microsoft.TeamFoundation.WorkItemTracking.Proxy.WorkItemServer.GetWorkItem(String requestId, Int32 workItemId, Int32 revisionId, Int32 minimumRevisionId, Nullable1 asOfDate, Boolean useMaster, IWorkItemRowSets& workItem, MetadataTableHaveEntry[] metadataHave, String& dbStamp, IMetadataRowSets& metadata) at Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemStore.LoadWorkItem(Int32 id, Int32 rev, Nullable1 asof, IWorkItemRowSets& witem) at Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItem..ctor(WorkItemStore store, Int32 id, Int32 revision) at VstsSyncMigrator.Engine.WorkItemStoreContext.GetRevision(WorkItem workItem, Int32 revision) in D:\a\1\s\src\VstsSyncMigrator.Core\Execution\ComponentContext\WorkItemStoreContext.cs:line 202 at VstsSyncMigrator.Engine.WorkItemMigrationContext.ReplayRevisions(List1 revisionsToMigrate, WorkItem sourceWorkItem, WorkItem targetWorkItem, Project destProject, WorkItemStoreContext sourceStore, Int32 current, WorkItemStoreContext targetStore) 在 D:\a\1\s\src\VstsSyncMigrator.Core\Execution\MigrationContext\WorkItemMigrationContext.cs:line 323 [错误] [完成：55/837][sid:16308 |Rev:15][tid:null | System.NullReferenceException：对象引用未设置为对象的实例。在 D:\a\1\s\src\VstsSyncMigrator.Core\Execution\MigrationContext\WorkItemMigrationContext.cs 中的 VstsSyncMigrator.Engine.WorkItemMigrationContext.ProcessWorkItem(WorkItemStoreContext sourceStore, WorkItemStoreContext targetStore, Project destProject, WorkItem sourceWorkItem, Int32 retryLimit, Int32 retrys) ：第 197 行 migration.exe 警告：0：[异常] System.NullReferenceException：你调用的对象是空的。在 D:\a\1\s\src\VstsSyncMigrator.Core\Execution\MigrationContext\WorkItemMigrationContext.cs 中的 VstsSyncMigrator.Engine.WorkItemMigrationContext.ProcessWorkItem(WorkItemStoreContext sourceStore, WorkItemStoreContext targetStore, Project destProject, WorkItem sourceWorkItem, Int32 retryLimit, Int32 retrys) :D:\a\1\s\src\VstsSyncMigrator.Core\Execution\MigrationContext\WorkItemMigrationContext.cs 中 VstsSyncMigrator.Engine.WorkItemMigrationContext.InternalExecute() 的第 244 行：VstsSyncMigrator.Engine.MigrationContextBase.Execute() 中的第 124 行D:\a\1\s\src\VstsSyncMigrator.Core\Execution\MigrationContext\MigrationContextBase.cs：第 35 行