Hey aerrojorda!
If you haven't already, make sure the app has the necessary permissions granted. It could be a faulty .rpa download so I'd recommend redownloading and trying again, but grabbing from our Patreon (the servers on Itch can be a little wonky).
You'll need a Patreon account, which is free to create if you don't have one already. Here's a link to the latest free version: