You might have created a target after updating Xcode, which made 8.3 the iOS Deployment Target in Build Settings for that target.
I fixed this by:
- Setting the iOS Deployment Target to 8.0 (Which is the same as the rest of the project)
Note iOS version mismatch in this screenshot (one is 10.0, other is 9.3)
Note iOS versions now match (make sure they all match)
- Doing a clean (Command+Shift+k) and build
If a clean+build doesn't fix it, switching the device/simulator that you are deploying to from the scheme menu and building again should help.
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