Storyboard broken after updating Xcode to version 10.3 (10G8) & app no longer is running

Question

I just updated the Xcode to version 10.3 (10G8).

Now my project is not run with this error:

Answer 1

I had the same issue, all i did is

clear constraint, for my case the source was from UITableView, and make sure constraints are attached to safeare not superview. see image

from toolbar on the top go to Editor > Canvas > Layout Rectangle Very important you have to repeat this step 3 times

Quit XCode and reopen it again , all should be fixed

I've noticed this happen when i switch view for different devices 8, 11, 4s

Good luck

Answer 2

I restarted my mac, the problem solved.

Answer 3

Running sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService from terminal solved my problem.