"It looks like something went wrong. Please try again."

I've hade one property listed for a while. Now I want to add three more, but on each of them, when I'm pressing the final "open for bookings", there is an error message "It looks like something went wrong. Please try again."

I've gone through these now several times during different days, and it's still the same message. It happens also when I press the other alternative "I'm not ready", and give any cause.

Anyone know the solution?