Code signing Error: Application failed codesign verification

Question

I am very new to iOS development, I have an app all set and ready to be distributed, but I seem to get this error every single time I run the application on my DEVICE only,

Answer 1

May be xcode selects one of the development profile to sign the code with it.

Make sure it uses the distribution profile

press the project, in the Build Settings -> Code Signing section expand Code Signing Identity -> Release - > make sure that Any iOS SDK is referring to distribution profile.