A build only device cannot be used to run this target

Question

I get this error when I trying to test an app.

A build only device cannot be used to run this target.

No supported iOS devices are available

Answer 1

I tried almost anything above, including restarting XCode, none of them worked for me. I solved this problem by simply restarting my Mac. Yes, the classic solution.

A side note: This problem occurred to my XCode after it requested my Mac password from me, probably after an automatic upgrade.