Clean install of v16.1 – can’t open official Backup app

As in the title, I’ve just bought a 2017 nvidia Shield TV and installed Kodi via Google Play.

I then installed the Backup app via the Kodi repository (with the intention of restoring my build I’d backed up from my FireTV box)

Everything seemed to be going as usual, with the various parts coming up quickly as installed, and finally the backup app notified as being installed too…followed by an ‘error – see log’ message.

When I try to start it, I get the error message every time. I’ve got the log viewer installed, but it all means nothing to me I’m afraid.

Can anyone help me out here plz?

Thanks in advance if you can…