babelhelpers.async to generator is not a function
Have you got the issue? I have a news for you.
Run in terminal
yarn add babel-preset-react-native-stage-1
or if you have npm
npm install babel-preset-react-native-stage-1 --save-dev
Check your .babelrc file
"presets": ["react-native-stage-0", "react-native"]
this is help.