Application not starting, manually

I am developing an iPhone application which works perfectly when doing a build & run, it runs like a charm.

But after I exited the app which ran from the build & run, an I try to start it manually by pressing the app icon on the phone it won't run.

The app shows the Default.png but after th开发者_运维技巧at it does nothing and just quits the app. Anyone has an idea why?

First stop: iphone crash logs available via the organizer