It might help to specify the exact build you are running [HOWTO] Give complete /e/OS version info easily for support, answers, comparison etc.
I guess the previous owner did a Factory reset so that you yourself ran the “First start wizard” when you started ?
Did this error appear very soon after that or later ? It might help if you describe anything you did since.
Did you install or add an SD card (if applicable), some advice here for a different phone, but often can apply for /e/. https://forum.fairphone.com/t/a-little-guide-to-using-sd-cards/37297.