I've gotten this prompt for things that might be considered NSFW or copyright problems. But yesterday I tried to insert satan into an image I was working on. I selected the area, typed in "Satan in the garden of Eden", and PS worked for about a minute and then did nothing. So I tried a number of other prompts - Satan, Lucifer, the devil etc. Nothing. I thought maybe Generative fill was broken, so I tried "top hat", and after 15 seconds or so, I got a top hat. Generative fill is a great idea, but honestly every single time I've tried it, it has been a huge disappointment at best. Mostly it wastes my time, so I've stopped using it. The warning you got above is because you're asking PS to create an image it doesn't want to for whatever reason. Maybe it's NSWF, or maybe it's a copyright issue, but that's the issue.
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