It's not an error on the site.
I'm building 3 websites for a client. When I have the design finished, including some example pages, they will then take over and add their own content.
It makes no sense that they have to log into MY Joomlart account to do this.
I've used Akeeba for years now. All I need on any website is a serial number (download ID).
Some components ask for a URL so that component knows that a purchased product is being used on a valid site.
You need some other kind of authorization besides logging into Joomlart with MY user/password to use the page builders.