Duplicate site on marketplace

I installed version 9.3.2, connected the site to the marketplace, downloaded and installed theme, had a good play, uninstalled cms and reinstalled. When I go to Dashboard / pages and Themes / Themes and click on Get More Themes I get this error:

Argument 1 passed to Concrete\Core\Marketplace\PackageRepository::validate() must be an instance of Concrete\Core\Marketplace\ConnectionInterface, null given, called in /home/plutocpn/pluto.nz/travel44/concrete/src/Page/Controller/MarketplaceDashboardPageController.php on line 23

I notice that in community.concretecms.com My Sites I have two sites with the same name and I suspect that’s my problem.

How do I delete both sites and start again?

Yep, I have the same problem although I only want to remove one instance, like we used to be able to do when they were called ‘Projects’

Same here. Trying to move to V.9, but seems not quite ready.