Debugging ok on iPhone4 but EXC_BAD_ACCESS on iPod Touch and iPhone 3G

I'm developing an app on my Macbook debugging it on my iPhone4. The app make use of camera, internet connections, and normal stuffs. Today I'm trying to debug it on an iPod Touch 2G and on an iPhone 3G......but it always install the app on the device, it says "running" but before the app il really launched I get a "EXC_BAD_ACCESS".....non message...even NSZombi开发者_Python百科eEnabled didn't work!!

Any help?

Thanks

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Check the stacktrace when it crashes then look up the last called function. It might be a new API function and in that case you must first check for it's existence in the installed iOS version.