IPhone 3.0 sdk install in device problem

I cannot install app on device using iphone3.0sdk, xcode give me this message:

no runnable executable in the path

In my group window, the product folder contains the file name1.app

, but is highlighted in red and always stays there. Even thought I changed my product name to name2

, the message always said it name1.app

could not be found along the way, but my current product name should name2.app

already be .

Build on simulator is fine, product app file will change based on product name but doesn't work when installed on device.