Object reference not set to an instance of an object: Fixed in v15.1.7-Preview.4

[Moieen699]

@joergbattermann @dpiessens @XREvo @jtucker @rfennell @MrHinsh

Dear All,

I had used latest 15.1.6 version where the fix to object reference not set to an instance of an object but still issue persist for me.

Error attached. Please don't close as duplicate. I already checked the #1999 But not resolved.

My json is below:
{
"ChangeSetMappingFile": null,
"Source": {
"$type": "TfsTeamProjectConfig",
"Collection": ,
"Project": ,
"ReflectedWorkItemIDFieldName": "Custom.ReflectedWorkItemId",
"AllowCrossProjectLinking": false,
"AuthenticationMode": "AccessToken",
"PersonalAccessToken": ,
"PersonalAccessTokenVariableName": "",
"LanguageMaps": {
"AreaPath": "Area",
"IterationPath": "Iteration"
}
},
"Target": {
"$type": "TfsTeamProjectConfig",
"Collection": ,
"Project": ,
"ReflectedWorkItemIDFieldName": "Custom.ReflectedWorkItemId",
"AllowCrossProjectLinking": false,
"AuthenticationMode": "AccessToken",
"PersonalAccessToken": ,
"PersonalAccessTokenVariableName": "",
"LanguageMaps": {
"AreaPath": "Area",
"IterationPath": "Iteration"
}
},
"FieldMaps": [
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "System.Description",
"TargetField": "System.Description"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "Microsoft.VSTS.Common.AcceptanceCriteria",
"TargetField": "Microsoft.VSTS.Common.AcceptanceCriteria"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "Microsoft.VSTS.Scheduling.StartDate",
"TargetField": "Microsoft.VSTS.Scheduling.StartDate"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "Microsoft.VSTS.Scheduling.TargetDate",
"TargetField": "Microsoft.VSTS.Scheduling.TargetDate"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "System.Title",
"TargetField": "System.Title"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "System.State",
"TargetField": "System.State"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "System.AssignedTo",
"TargetField": "System.AssignedTo"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "",
"SourceField": "System.Tags",
"TargetField": "System.Tags"
},
{
"$type": "FieldtoFieldMapConfig",
"WorkItemTypeName": "*",
"SourceField": "System.ChangedBy",
"TargetField": "System.ChangedBy"
}
],
"GitRepoMapping": null,
"LogLevel": "Debug",
"CommonEnrichersConfig": [
{
"$type": "TfsNodeStructureOptions",
"Enabled": true,
"NodeBasePaths": [],
"AreaMaps": {

        },
        "IterationMaps": {

        },
        "ShouldCreateMissingRevisionPaths": true,
        "ReplicateAllExistingNodes": true
    },
    {
        "$type": "TfsTeamSettingsEnricherOptions",
        "Enabled": true,
        "MigrateTeamSettings": true,
        "UpdateTeamSettings": true,
        "MigrateTeamCapacities": true,
        "Teams": null
    },
    {
        "$type": "TfsWorkItemLinkEnricherOptions",
        "Enabled": true,
        "FilterIfLinkCountMatches": true,
        "SaveAfterEachLinkIsAdded": false
    },
    {
        "$type": "TfsRevisionManagerOptions",
        "Enabled": true,
        "ReplayRevisions": true,
        "MaxRevisions": 0
    },
    {
        "$type": "TfsAttachmentEnricherOptions",
        "Enabled": true,
        "ExportBasePath": "c:\\temp\\WorkItemAttachmentExport",
        "MaxRevisions": 480000000,
        "MaxAttachmentSize": 20971520
    },
    {
        "$type": "StringManipulatorEnricherOptions",
        "Enabled": true,
        "MaxStringLength": 1000000,
        "Manipulators": [
            {
                "$type": "RegexStringManipulator",
                "Enabled": true,
                "Pattern": "[^( -~)\n\r\t]+",
                "Replacement": "",
                "Description": "Remove invalid characters from the end of the string"
            }
        ]
    },
    {
        "$type": "TfsUserMappingEnricherOptions",
        "Enabled": false,
        "UserMappingFile": "C:\\temp\\userExport",
        "IdentityFieldsToCheck": [
            "System.AssignedTo",
            "System.ChangedBy",
            "System.CreatedBy",
            "Microsoft.VSTS.Common.ActivatedBy",
            "Microsoft.VSTS.Common.ResolvedBy",
            "Microsoft.VSTS.Common.ClosedBy"
        ]
    }
],
"Processors": [
    {
        "$type": "WorkItemMigrationConfig",
        "Enabled": true,
        "UpdateCreatedDate": true,
        "UpdateCreatedBy": true,
        "FixHtmlAttachmentLinks": true,
        "WorkItemCreateRetryLimit": 5,
        "FilterWorkItemsThatAlreadyExistInTarget": true,
        "WIQLQuery": "SELECT [System.Id] FROM WorkItems WHERE [System.WorkItemType] IN ('Feature') AND [System.TeamProject] = @TeamProject AND [System.Id] IN (74126, 74462) ORDER BY [System.ChangedDate] DESC ",
        "PauseAfterEachWorkItem": false,
        "AttachRevisionHistory": true,
        "GenerateMigrationComment": true,
        "WorkItemIDs": null,
        "MaxGracefulFailures": 0,
        "SkipRevisionWithInvalidIterationPath": false,
        "SkipRevisionWithInvalidAreaPath": false
    },
    {
        "$type": "WorkItemPostProcessingConfig",
        "Enabled": true,
        "WIQLQuery": "SELECT [System.Id] FROM WorkItems WHERE [System.TeamProject] = @TeamProject AND [System.WorkItemType] NOT IN ('Test Suite', 'Test Plan','Shared Steps','Shared Parameter','Feedback Request') ORDER BY [System.ChangedDate] desc",
        "WorkItemCreateRetryLimit": 5,
        "FilterWorkItemsThatAlreadyExistInTarget": true,
        "PauseAfterEachWorkItem": false
    },
    {
        "$type": "ExportUsersForMappingConfig",
        "Enabled": true,
        "WIQLQuery": "SELECT [System.Id] FROM WorkItems WHERE [System.TeamProject] = @TeamProject AND [System.WorkItemType] NOT IN ('Program', 'Portfolio', 'Test Suite', 'Test Plan','Shared Steps','Shared Parameter','Feedback Request') ORDER BY [System.ChangedDate] desc",
        "OnlyListUsersInWorkItems": true,
        "UserMappingFile": "C:\\temp\\userExport" 
    }
],
"Version": "15.1",
"workaroundForQuerySOAPBugEnabled": false,
"WorkItemTypeDefinition": {
    "User Story": "Product Backlog Item",
    "Bug": "Bug",
    "Task": "Task",
    "Epic": "Epic",
    "Feature": "Feature",
    "Action": "Task",
    "Product Backlog Item": "Product Backlog Item",
    "Change Request": "Change",
    "Spike": "Spike"
},
"Endpoints": {
    "InMemoryWorkItemEndpoints": [
        {
            "Name": "Source",
            "EndpointEnrichers": null
        },
        {
            "Name": "Target",
            "EndpointEnrichers": null
        }
    ]
}

}
Can anyone please help me out asap.

[dpiessens]

You configuration looks roughly correct. I haven't used or contributed to this in almost 6 years. I do remember that order of extensions matter so try adjusting that.

[joergbattermann]

Can you please stop referencing me in your posts, issues and questions @Moieen699 ? I don't know who or what gave you the idea you could do that but that's not how all this good faith & good will thing works.

[Moieen699]

I apologize for any inconvenience or discomfort caused by me for referencing you in my posts, issues, and questions. I assure you that it was not my intention to cause any disturbance or misuse your time and attention.
Moving forward, I will refrain from mentioning you in any future communications.

[MrHinsh]

@Moieen699 I'm not sure why you are referring to #1999 as its completely unrelated to this, except for the error message. Object reference not set to an instance of an object. can be for many, many reasons... all poor coding :) but this particular issue was addressed in v15.1.7-Preview.4 and we are on v15.1.7-Preview.5 now.

Please ensure that you update to the latest version BEFORE raising an issue?

[Moieen699]

Dear @MrHinsh,

I am getting the below error. As suggested I had tried with v15.1.7-Preview.4 and also latest release 15.1.7

The error is below.

Now please help me out with the above error. I had tried with 15.1.5 to 15.1.7 (Latest) also. But error was not resolved.

[MrHinsh]

This is not the same error as the rest of the thread?

Have you looked at the other threads and the issues on this error?

[MrHinsh]

Also, you only need to check the latest, and the latest preview.

All other versions are obsolete unless stated otherwise.

[Moieen699]

Dear @MrHinsh,

I am trying to migrate the particular work item that is feature within same organisation.

"WIQLQuery": "SELECT [System.Id] FROM WorkItems WHERE [System.WorkItemType] IN ('Feature') AND [System.TeamProject] = @teamproject AND [System.Id] IN (74126) ORDER BY [System.ChangedDate] DESC ",

When i had ran with 15.1.6 latest release last week, then i got issue : Object reference not set to an instance of an object.
For this as per your suggestion i had tried with v15.1.7-Preview.4 and also latest release 15.1.7. Now i am getting again ChangedBy Value error.

Previously also I had raised discussion for this error. (#2178) But it is closed as duplicate then i thought to update my version so done same and checked it. It then throwed object refrence error now again ChangedBy Value error. It is going in loop.

Thats why i am asking for help. Please help me.

[MrHinsh]

Did you check the linked duplicate?

This is a known issue that we have not found a way around. You are welcome to try to figure it out.