Hi @sunil_healiom,
Are you trying to run the example app included with the React Native wrapper? If so, it does not seem that you are correctly following our documentation to set up and run the example. After adding the native iOS and Android SDKs to the project (depending on which platform you’d like to run it on), the documentation here should get you up and running.
Note that since you tried using NPM directly, you may need to start with a fresh copy of the example app since it uses yarn.
Thanks!