Native module ExtraDimensionsModule tried to override ExtraDimensionsModule for module name ExtraDimensions. If this was your intention, set canOverrideExistingModule=true

[gao520sun]

react-native : 0.46.4
' new ExtraDimensionsPackage()', No duplicate

[hanyoureal]

in android/app/src/main/java/../../MainApplication.java

where you have:

protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(

check if you have duplicate

new ExtraDimensionsPackage()

or any other packages

i think this happened to me because i manually fixed the indentation of the classes added by running 'link' but i have to test it again to confirm