CoreData: annotation: Failed to load optimized model at path - Issue with starting iOS simulator

Log:

Scanning folders for symlinks in /Users/../../../__app__/node_modules
Found Xcode workspace Name.xcworkspace
CoreData: annotation:  Failed to load optimized model at path '/Applications/Xcode.app/Contents/Applications/Instruments.app/Contents/Frameworks/InstrumentsPackaging.framework/Versions/A/Resources/XRPackageModel.momd/XRPackageModel 9.0.omo'

Could not find iPhone 6 simulator

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! AppName@10.0.17 start:ios: `react-native run-ios && react-native log-ios`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the AppName@10.0.17 start:ios script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/../.npm/_logs/2019-11-19T11_21_06_483Z-debug.log

Checked here: https://github.com/react-native-community/cli/issues/739 but I'm not sure if this is my exact issue.

Beginner to react-native following the getting started guide here https://facebook.github.io/react-native/docs/getting-started.html

Trying to set up the environment for another app on GitHub I'm working on and running into a couple of issues.

Steps I've already taken (to run on ios).

1. I've installed the dependencies in project directory
2. Set up .env for local dev
3. Installed cocoapods sudo gem install -n /usr/local/bin cocoapods
4. pod install cd ios && pod install

Now when I try to run the emulator using this command: npm run start:ios With this script: react-native run-ios && react-native log-ios in package.json

Xcode is closed while trying to do all of this.