application not working on OSX 10.5

I am developing an application to work on Mac OSX 10.5 and later and I am using Mac running 10.6.4 with Xcode 3.2.4. The application is very simple which accepts some information from user and stores it in a fil开发者_如何学运维e. The application working perfectly on OSX 10.6 but on OSX 10.5.8 when I double click on it to open it does not start at all. In project settings I have base SDK set to 10.5, architectures -> standard 32/64 bit Universal, GCC 4.0 and in info.plist file I have set LSMinimumSystemVersion key to '10.5.0' but still application is not running on OSX 10.5.8. What am I doing wrong? Any help would be appreciated. Thank you. Console Log:

Is this of any help?

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Looks like you're sharing the app bundle via DropBox.

Per their support forum, DropBox does not properly support permissions. This screws up the permissions on app bundles. Zip the app before sharing on DropBox.