Missing app.json when ejecting

When I run npm run eject after create-react-native-app (CRNA), I get the error message in my Terminal saying

> Error: Missing app.json. See https://docs.expo.io/ , Couldn't read app.json.

I read on forums that I might need to specify SdkVersion in my app.json, but when I run

npm run eject

app.json changes back to its’ original version, with no version specified.

I am running Node 8.10.0, npm 6.2.0, react-native 0.55.4. I am using Ubuntu 18.04.

If you solved this before, please let me know how! Thanks!

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