I have developed an app that required iOS >= 4.0. But when I download it from App Store by using my iPod touch 2 (iOS 4.2.1), it says "This App Is Incompatible With This iPod touch". I don't know why. And when I use this iPod touch to run the app through Xcode, it also don't run on my iPod touch. How can I debug this error?
I have read this and my app build settings show that "Architectures" is "Standard(armv7)" and "Valid Architectures" is "armv6 armv7", I wondered if it's wrong.