Macbook pro to imac its not working

I am trying to setup my Luna display with my macbook pro and my imac. they are connected to the same wifi and I am following the instructions. But its not connecting. any idea why?

Someone posted a link to the updated Luna app on a different thread that I created. It seemed to resolve this issue for me. https://s3.amazonaws.com/astro-hq.com/luna/debug/LunaDisplay-4.0.4-take2.dmg