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
cd android
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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