expo is out of date uninstall and run again to upgrade
The issue is to do with the app that is on the iOS simulator / device is out of date and is not compatible with the current version of Expo that you running.
Delete the Expo app from the the iOS simulator and it should work, or install the latest update if you are on a device
https://github.com/expo/expo/issues/1595
One way to do it is with the simulator open is to Erase All Content and Settings. Then re-run npm start and the Expo App will be installed again on this device simulator.
Please, try this:
1.- npm cache clean -f2.- yarn upgrade3.- npm upgrade3.- npm installIf this doesn't work try edit package.json:
{ "react-native": "https://github.com/expo/react-native/archive/sdk-34.0.0.tar.gz", "expo": "^34.0.1", "react": "16.8.3"} Then
npm installlet me know if this works for you