Trying to follow tutorial here

https://www.youtube.com/watch?v=giA3shoA-vU&list=PLpRi3ovyFM-2wLhel2eP8srgXBqfHkJ4C&index=13

Nothing happens after I add my fibermesh curves to hairfrommeshstrips modifier.  Curves show as added in sidebar, nothing displays in viewport or at render, even after adding render elements modifier.