react-native

Hermes engine error

Hermes.*error|HermesInternal.*not available|hermes.*compilation.*failed

Fixes

1.Enable Hermes in android/app/build.gradle: hermesEnabled = true
2.For iOS, ensure hermes_enabled = true in Podfile and run pod install
3.Clear Hermes bytecode cache: npx react-native start --reset-cache

react-nativehermesengine

Related Errors

react-native3 fixes

Metro bundler crash or port conflict

Metro.*error|metro bundler.*crashed|EADDRINUSE.*8081

•Kill existing Metro process: npx kill-port 8081
•Clear Metro cache: npx react-native start --reset-cache

react-native3 fixes

React Native native module not found

Native module.*cannot be null|TurboModuleRegistry.*not found|NativeModules.*undefined

•Run npx pod-install (iOS) or rebuild the project after adding native deps
•For New Architecture, ensure the module implements TurboModule interface

react-native3 fixes

React Native Android Gradle build failure

Gradle.*BUILD FAILED|execution failed for task.*:app:

•Run cd android && ./gradlew clean then rebuild
•Check android/gradle.properties for JVM memory: org.gradle.jvmargs=-Xmx4g