在iPhone上安装应用程序：资源已被修改

I am working on a simple iPhone application and when I run my app on my machine it installs on the device, but when I try it on a Windows machine using an ad-hoc distribution profile, it shows an error: "Application couldn't be installed because a resource has been modified." I have 2 iPhones and have tested the same app; on iPhone 2G it works fine, but on the 3G it shows the error I have written above. I tried to change the certificate and provisioning profiles, but no luck. Please let me know where I am mistaken.I am working on a simple iPhone application and