We are trying to deploy using the Jisti Meet Android app on React Native but got error below any Idea please?

this is the error:
Application App has not been registered.

Hint: This error often happens when you're running the packager (local dev server) from a wrong folder. For example you have multiple apps and the packager is still running for the app you were working on before.
If this is the case, simply kill the old packager instance (e.g. close the packager terminal window) and start the packager in the correct app folder (e.g. cd into app folder and run 'npm start').

This error can also happen due to a require() error during initialization or failure to call AppRegistry.registerComponent.

2019-05-27 14:29:03.105 2121-2313/com.telehealthcare E/AndroidRuntime: FATAL EXCEPTION: mqt_native_modules
Process: com.telehealthcare, PID: 2121
com.facebook.react.common.JavascriptException: Application App has not been registered.

Hint: This error often happens when you're running the packager (local dev server) from a wrong folder. For example you have multiple apps and the packager is still running for the app you were working on before.
If this is the case, simply kill the old packager instance (e.g. close the packager terminal window) and start the packager in the correct app folder (e.g. cd into app folder and run 'npm start').

This error can also happen due to a require() error during initialization or failure to call AppRegistry.registerComponent.

being called twice…probably not from the original source. Have you modified react modules originally from jitsi source code or implementing completely your own?