"The application does not have a valid signature" Xcode 4.3
Just throwing this out there, might help someone in the future (and also would be good for my future reference).
I have a bigger project with 2 projects within (an API and the main project that is running on the device itself and which uses the API).
I have solved this problem by cleaning both projects and then rebuilding them.
This saved me: http://www.two-tails.com/2010/01/12/the-application-does-not-have-a-valid-signature/
Basically you cannot have a folder reference called "resources"! I changed to "rsrc" and magic.