CODEWITHSUNDEEP
react-nativeexpometro-bundlereas
jpryor
jpryor

Reputation: 91

Why does my Expo app run in Expo Go but not as a development build?

I've created a development build of an Expo app using EAS. Previously I would open the app in Expo Go by running npx expo start and scanning the Metro Bundler QR code.

Now, when I try to do the same thing, Expo Go asks whether I want to open the project in Expo Go or as a "Development Build". It works fine in Expo Go, but crashes immediately when I attempt to open the dev build. The error reads:

null is not an object (evaluating '_ReanimatedModule.default.createNode')

This error is suspiciously similar to one that I encountered earlier in development, which I resolved by downgrading to React Native version 0.69.6. I'm also encountering a second error that says "'main' has not been registered", but I suspect this is downstream of the first error.

I have the same issue when I try to run the app with npx expo start --dev-client.

Any ideas why I might be having this problem?

Upvotes: 9

Views: 19215

Answers (3)

PHANTOM-X
PHANTOM-X

Reputation: 586

I had the same issue, I simply rebuild using EAS with this command

eas build --platform android --profile development

you can follow these steps

Upvotes: 0

bojans91
bojans91

Reputation: 41

Not sure if this is relevant anymore, but for me what worked was uninstalling expo-dev-client package.

Upvotes: 4

teewuane
teewuane

Reputation: 5734

It sounds like you may have run expo prebuild (https://docs.expo.dev/workflow/prebuild/) which removes "main": "node_modules/expo/AppEntry.js", from app.json. Try to create a new expo app and look at it's app.json file.

When you run expo prebuild it changes a few things with your project (see "side effects" in the prebuild docs).

I'm actually working through some issues with that right now too. I thought I had to run prebuild but turns out I didn't have to. Ever since I ran it my app will not load via the dev-client way. I can however switch back to npx expo start (NOT npx expo start --dev-client, see the scripts section of app.json as that is also changed when prebuild is run).

Let me know if you are able to get your app to load after re-adding the main stuff to app.json.

Ps, are you by chance using react-native-google-mobile-ads?

Upvotes: 6

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