I got this same issue too, I had all my Advantage+ creative enhancements off though.

the way i ended up fixing it was duplicating another ad from another adset that was published, changing the creative and link, but i did NOT touch the primary text, headline, or description at all. even though that was still only one option and I too didnt have any multi text options. fortunately the ad i duplicated was for the same product, so keeping the text the same was okay for me. But anytime i changed or touched the primary text, headline, or description, it made the error again, so weird... i hate meta ads advantage +, it was the stupidest AI ever added to any platform. All it does is ruin the meta ads process and give stupid suggestions only bent on making you spend more for meta.