Why cant i record with iphone Headphones on the iPad

Why cant i record with iphone Headphones on the iPad. Its always saying "unable to record" if i try to record smth. On the iphone theres no problem. And with another headset which has a mic too its also not working. Whats the problem???

Rapaholix about MOGUL Songwriting & Recording Studio with Free Music Beats, v1.4