React-Native: Module AppRegistry is not a registered callable module

i just upgraded to react-native 0.18.1 today tough having some peer dependencies issues with 0.19.0-rc pre-release version.

Back to your question, what I did was

  1. cd android
  2. sudo ./gradlew clean (more information about how clean works here)

then back to the working directory and run
react-native run-android

you should restart your npm too after that upgrade.

hope this works for you.

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