Extension of Type 'UiPath.Activities.Contracts.Persistence.IPersistenceBookmarks' must be configured error

Dear all, I was trying out the exercise on UiPath academy on the AI/ML Movie Review practice. I started from scratch and followed the solution step by step, and copied the solution step by step. Everything was working fine until one of the last part “Task for Human Validation” where I get the following error:


Message: An extension of type ‘UiPath.Activities.Contracts.Persistence.IPersistenceBookmarks’ must be configured in order to run this workflow.

Exception Type: System.Activities.ValidationException

RemoteException wrapping System.Activities.ValidationException: An extension of type ‘UiPath.Activities.Contracts.Persistence.IPersistenceBookmarks’ must be configured in order to run this workflow.
at System.Activities.Hosting.WorkflowInstanceExtensionCollection…ctor(Activity workflowDefinition, WorkflowInstanceExtensionManager extensionManager)
at System.Activities.Hosting.WorkflowInstanceExtensionManager.CreateInstanceExtensions(Activity workflowDefinition, WorkflowInstanceExtensionManager extensionManager)
at System.Activities.Hosting.WorkflowInstance.RegisterExtensionManager(WorkflowInstanceExtensionManager extensionManager)
at System.Activities.WorkflowApplication.EnsureInitialized()
at System.Activities.WorkflowApplication.Enqueue(InstanceOperation operation, Boolean push)
at System.Activities.WorkflowApplication.SimpleOperationAsyncResult.Run(TimeSpan timeout)
at System.Activities.WorkflowApplication.BeginRun(AsyncCallback callback, Object state)
at UiPath.Executor.RobotRunner.d__89.MoveNext()

If I disable the “Wait for Form Task and Resume”, it works. I check back and forth and couldn’t find any difference between my built from scratch version and that of the one downloaded from UiPath Academy (which works when running from the same machine).

Any help would be appreciated.

Here’s the link to the source code but you’ll have to be connected to AI center and configure the respective MLSkill etc.

Thank you and stay safe.

I’ve managed to solve it a moment after posting in the forum.

For those who are interested in the solution, click on the “Wait for Form Task and Resume” and select “Project Settings”. Under the “General” tab on the left, choose “yes” for “Starts in background” and “Supports Persistence”

I’m almost done with this part of the practice, just a little more on the form design to go.


Hi @m.tan @Tan_Yong_Heng

I too get this error when i’m working on action center but its a simple mistake after enabling it my error will be gone. its simple mistake. sharing my thoughts here…



I have enabled supports persistence, but still getting the error.
any other settings has to be enabled?
Thank you


Did you manage to resolve this? I have the same problem

You will have to create a orchestration process and Add “Wait for Form Task” activity in the main.xaml. This activity cannot be under any other workflow apart from Main Workflow.
This how I solved.


go to project setting
general- check persistence support