Application Project has not been registered

Question

I am trying to run my react native app on my device . So I am running react-native start everything looks fine.

and when running react-native run-android I get this error

otherwise, I get this error in my device

Answer 1

My issue was the name I gave the project differed from the name that was being registered in AppRegistry

AppRegistry.registerComponent('proj', () => proj)

proj needs to be the same as the name of the project in the gradle and config files.