Xcode won't let to build for Device after denying Codesign to access Keychain
I found a solution for that. If that error occurs, only you have to do is just lock the keychain (click on lock in the left upper most corner). Then build again. It will ask to unlock again like first time and Let you to choose always allow or allow or deny in Codesign keychain access. Just type account (Mac User account) password and click on always allow. Then project will build successfully.