Most Expo errors fall into one of four layers: Metro couldn't bundle your code, JavaScript crashed at runtime, a native module is missing from the binary you're running, or the native build (Xcode or Gradle) failed. Naming the layer first is half the fix.

Here are the ten errors that come up most, what they mean and how to fix them. If yours isn't here, paste it into the free React Native & Expo Error Fixer and it will explain the cause and the fix.

Before anything else, two commands fix a surprising number of problems:

npx expo start --clear # restart Metro with an empty cache npx expo-doctor # check your project for known issues

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