Module AppRegistry is not registered callable module (calling runApplication)

Question

I am using native base for making app in react-native. I am new to both things. When I run the app It gives me this error:

Here is my code:

Answer 1

I am using Expo

In my case, I resolved the issue by adding the following code in app.json file

"expo":{
  ...
  "android": {
    "package": "com.mycompanyname.myappname
  }
}