main.jsbundle does not exist. this must be a bug with + echo 'react native

Add this line to scripts in your package.json file.

"build:ios": "react-native bundle --entry-file='index.js' --bundle-output='./ios/carkit/main.jsbundle' --dev=false --platform='ios' --assets-dest='./ios'",

And then run

npm run build:ios