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It means your client (looks like Jerboa) wants Lemmy API version 0.18 but lemmy.world has not been updated yet. Hang tight, I believe the admins are overloaded with the new user influx.
I also see the same thing.
For accuracy, it’s not just about the admins being busy, 0.18.0 removed the signup captcha, which has been crucial for preventing massive bot signups into instances, some number of instances can’t upgrade without that critical downside. The plan is for the captcha to be reintroduced in 0.18.1, so we’re all waiting for that.
Anyone know why Captcha was removed?
Because it was implemented using WebSockets, which was torn out for 0.18. They need to reimplement a captcha using HTTP instead. Not the most difficult job or anything, just didn't make the cut for 0.18 in the interests of getting it out there.