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you people complaining about this not working did you actually leave room for the sisters on the board? This isn't a tribute summon you need an open space for the card. Also if you were dueling the vagabond he has a no special summons challenge and that could be causing the problem as well. I've used this multiples times and it works fine.
I am having the same problem. I have Harpie Lady on the field, and Harpy Lady Sisters in my hand/deck, but I'm unable to activate the spell for some reason. There are no effects on the field preventing me from using it.
I have Harpie Lady on my side of the field and Harpie Lady Sisters and Harpie Lady 2 in my hand and deck respectively but it's just not working. Anytime I try to use it the only option is to set it. How do I make it work?