error Could not find "iPhone X" simulator. Run CLI with --verbose flag for more details.
error Command failed with exit code 1.
In my case, the iPhone X Simulator wasn't installed.
I verified installed simulators before and after with:
xcrun simctl list devices
- Open Xcode
- Select Window > Devices and Simulators from the top menu bar
- In the Devices and Simulators window, select the Simulators tab
- Add the iPhone X (and any others) in the left sidebar
- Don't give it a custom name since RN is looking for iPhone X
- Click Create