HTML5 iPad app not working on iPad1

I recently developed a phonegap HTML5 app and it is working fine on my iPad 2's and android devices. When I install the app onto my iPad 1's the app installs, the icon disappears, then after rebooting the icon is back and looks as if it is installed.

I can launch the app, and the splash screen is displayed, then the app just closes.

Here are my deployment settings - I'm quite new to this, so if there are any relevant settings you need to know about, let me know and I'll update my post.