为什么我的Android应用程序不能安装在这个设备上？

I've built a release candidate of our Unity3d android game, and I've tried it on multiple devices. It's working everywhere except on this one Samsung Captivate. On that one device, it refuses to even install. You try installing from the APK and it thinks for a moment, then tells you the application wasn't installed. No more information than that. I've built a release candidate of our Unity3d a