Why this Behavior Tree is not working?

I follow this tutorial steps https://docs.unrealengine.com/latest/INT/Engine/AI/BehaviorTrees/QuickStart/index.html
but my behavior tree is not working and I don’t know whyalt text.
The bot should follow the player when he is aorund.

Hello guivmc,

I have a few questions for you that will help narrow what issue it is that you are experiencing.

Quick questions:

  1. Can you reproduce this issue in a clean project?
  2. If so, could you provide a detailed set of steps to reproduce this issue on our end?
  3. Could make sure that you have included a navigation mesh into your level?

Hello guivmc,

We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.

Thank you.