Well seeing as everyone seems to disagree with me, I'm gonna defend myself. At the start, when you first learn rolls, PAIN IS A TEACHER!!! It shows you what to do and what not to do. SO at first, you prolly will feel pain. Did any of you get it perfect the first time? I seriously doubt it. I'm sure that you felt some pain, and then you realized what you were doing wrong, and you fixed it, and it didn't hurt anymore.
Also the thread starter did not specify what kind of pain. Does he mean spine pain like, bone pain? If so, then yes, you're doing something wrong. But if it is just surface pain, which is what I figured, then it prolly IS just being new to rolls. For example, if you scrape your back on a roll, I would say that you maybe did a little thing wrong, but it is no big deal. Another example, if on one roll you maybe hit your back a little, and then on the next one, it is ok, then GUESS WHAT!!! You made a mistake, but your roll technique might not be all that bad.
I don't appreciate being called an idiot. I may not have a whole lot of experience, but I do know that my roll technique is pretty good, and I have never hurt myself doing ANYTHING in pk or fr. So please, if your gonna jump down my back and flat tell me I'm wrong, realize I may be confused, or I may have taken a different meaning of the original post.