Swift Sdtlib tool error: Task failed with exit code 1

Question

So randomly after several hours of work this morning on my app, Xcode just stopped letting me test my app on my iPhone. But I can still test it in the simulator.

Now

Answer 1

What I did to solve it was:

1. Quit Xcode

2. Open Keychain Access

3. Go to Login tab

4. Drag your certificate into System tab

5. Reopen Xcode

6. Run your app