Girls, What does it actually mean when a woman says we have nothing in common?

I've had a couple of women say this to me, and in both cases I know for a fact we had things in common. Obviously, the women just weren't interested in dating me, but I'm curious to hear a woman's perspective on this.

When you tell a guy that you don't have anything in common with him, is that code for "you don't excite me?"

If not, what does it mean?

Girls, What does it actually mean when a woman says we have nothing in common?
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