React-native, “Native module cannot be null”

Question

I just upgrade React-native from 0.28 to 0.30, and get this error:

\"Native module cannot be null\".

The problem seem to be with the line/package:

Answer 1

My issue had the same symptoms but a much different root cause. I had two React Native projects open in two different instances of Xcode. My Metro bundler was still running from Project A and causing problems running Project B in the simulator.

The fix: close the old terminal window spawned by Xcode that had the Metro Bundler running and re-run the project.