Roon is reporting: Transport couldn't connect to HQ player [Resolved]

Hi,
I’m trying the Roon free on my PC (Windows) and it Works with my library on NAS.
i have downloaded roon to my Ipad to work as a command but, after presenting the files on the core in the PC if I try to send a command to play it gives a notice: " transport couldn’t connect to HQ player.
Can you help?