Issue with the AzureDevOpsPipelineProcessor

I am trying to migrate a pipeline from TFS Version Dev18.M170.6 to Azure devops services. unfortunately, it’s not working. Am i missing a parameter in the endpoints definition? I tried to look in the example config file from the documentation, but i couldn’t come up with anything. Here’s the configuration that i am using:

{
    "ChangeSetMappingFile": null,
    "GitRepoMapping": null,
    "LogLevel": "Information",
    "Endpoints": {
      
      "AzureDevOpsEndpoints": [
        {
          "name": "Source",
          "$type": "AzureDevOpsEndpointOptions",
          "Organisation": "https://devops-uat.ema.com/HR_OPS",
          "Project": "TFS Migration POC",
          "AuthenticationMode": "AccessToken",
          "AccessToken": "token",
          "EndpointEnrichers": null
        },
        {
          "Name": "Target",
          "$type": "AzureDevOpsEndpointOptions",
          "Organisation": "https://dev.azure.com/ifs/",
          "Project": "TFS Migration POC",
          "AuthenticationMode": "AccessToken",
          "AccessToken": "token",
          "EndpointEnrichers": null
        }
      ]
    },
    "Processors": [   
      {
        "$type": "AzureDevOpsPipelineProcessorOptions",
        "Enabled": true,
        "MigrateBuildPipelines": true,
        "MigrateReleasePipelines": true,
        "MigrateTaskGroups": true,
        "MigrateVariableGroups": true,
        "MigrateServiceConnections": true,
        "BuildPipelines": null,
        "ReleasePipelines": null,
        "RefName": null,
        "SourceName": "Source",
        "TargetName": "Target"
      }
    ],

    "Version": "11.9"
  }

Here’s a copy of the log file

[15:15:44 FTL] Error while running AzureDevOpsPipelineProcessor
System.NullReferenceException: Object reference not set to an instance of an object.
   at MigrationTools.Endpoints.AzureDevOpsEndpoint.<GetApiDefinitionsAsync>d__6`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MigrationTools.Processors.AzureDevOpsPipelineProcessor.<CreateServiceConnectionsAsync>d__20.MoveNext() in D:\a\1\s\src\MigrationTools.Clients.AzureDevops.Rest\Processors\AzureDevOpsPipelineProcessor.cs:line 391
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MigrationTools.Processors.AzureDevOpsPipelineProcessor.<MigratePipelinesAsync>d__9.MoveNext() in D:\a\1\s\src\MigrationTools.Clients.AzureDevops.Rest\Processors\AzureDevOpsPipelineProcessor.cs:line 80
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MigrationTools.Processors.AzureDevOpsPipelineProcessor.InternalExecute() in D:\a\1\s\src\MigrationTools.Clients.AzureDevops.Rest\Processors\AzureDevOpsPipelineProcessor.cs:line 47
   at MigrationTools.Processors.Processor.Execute() in D:\a\1\s\src\MigrationTools\Processors\Processor.cs:line 78
[15:15:44 INF] AzureDevOpsPipelineProcessor completed in 00:00:00.1255732
[15:15:44 ERR] AzureDevOpsPipelineProcessor The Processor MigrationEngine entered the failed state...stopping run
[15:15:44 INF] Application is shutting down...