My xcode version is 6.3.1, my app is a swift project with a WatchKit target.
Xcode showed this message "A signed resource has been added, modified, or deleted" when I ran it on my iPhone 6.
It works fine on iPhone 5s, iPad and simulator, so I guess this is not a certificate issue, right?
I tried deleting the "derived data" suggested in the question xcode 6 beta 7:A signed resource has been added modified or deleted.
After I delete the "derived data", the first time I run, it stopped automatically after "build succeeded"(the app didn't install to my iPhone), when I ran it again, the message showed again.
I also tried restart Xcode, Macbook, iPhone 6, still the same.