I am running Json script to transfer test plan and was getting this error. How to resolve or debug this.

“Sequence contains more than one element”

{

“ChangeSetMappingFile”: null,
“Source”: {
“$type”: “TfsTeamProjectConfig”,
“Collection”: “http://alpvbhnptfsa01.ent.bhicorp.com:8080/tfs/XXX/”,
“Project”: “XXXXX”,
“ReflectedWorkItemIDFieldName”: “Microsoft.VSTS.Build.IntegrationBuild”,
“AllowCrossProjectLinking”: false,
“AuthenticationMode”: “Prompt”,
“PersonalAccessToken”: “”,
“PersonalAccessTokenVariableName”: “”,
“LanguageMaps”: {
“AreaPath”: “Area”,
“IterationPath”: “Iteration”
}
},
“Target”: {
“$type”: “TfsTeamProjectConfig”,
“Collection”: “https://dev.azure.com/XXXXXXXX/”,
“Project”: “XXXXXXXXXX”,
“ReflectedWorkItemIDFieldName”: “Custom.ReflectedWorkItemId”,
“AllowCrossProjectLinking”: false,
“AuthenticationMode”: “AccessToken”,
“PersonalAccessToken”: “XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX”,
“PersonalAccessTokenVariableName”: “”,
“LanguageMaps”: {
“AreaPath”: “Area”,
“IterationPath”: “Iteration”
}
},
“FieldMaps”: [
{
“$type”: “MultiValueConditionalMapConfig”,
“WorkItemTypeName”: “*”,
“sourceFieldsAndValues”: { “System.State”: “New” },
“targetFieldsAndValues”: { “Microsoft.VSTS.Common.ActivatedDate”: null, “Microsoft.VSTS.Common.ActivatedBy”: null, “Microsoft.VSTS.Common.ClosedDate”:null, “Microsoft.VSTS.Common.ClosedBy”: null}
}
],
“GitRepoMapping”: null,
“LogLevel”: “Debug”,
“CommonEnrichersConfig”: null,
“Processors”: [
{
“$type”: “TestVariablesMigrationConfig”,
“Enabled”: true
},
{
“$type”: “TestConfigurationsMigrationConfig”,
“Enabled”: true
},
{
“$type”: “TestPlansAndSuitesMigrationConfig”,
“Enabled”: true,
“PrefixProjectToNodes”: false,
“OnlyElementsWithTag”: null,
“TestPlanQueryBit”: null,
“RemoveAllLinks”: false,
“MigrationDelay”: 0,
“UseCommonNodeStructureEnricherConfig”: false,
“NodeBasePaths”: [],
“AreaMaps”: null,
“IterationMaps”: {},
“RemoveInvalidTestSuiteLinks”: false,
“FilterCompleted”: false
}
],
“Version”: “14.4”,
“workaroundForQuerySOAPBugEnabled”: false,
“WorkItemTypeDefinition”: {
“sourceWorkItemTypeName”: “targetWorkItemTypeName”
},
“Endpoints”: {
“InMemoryWorkItemEndpoints”: [
{
“Name”: “Source”,
“EndpointEnrichers”: null
},
{
“Name”: “Target”,
“EndpointEnrichers”: null
}
]
}
}