https://www.reactnative.express/app/navigation preview not working

Hello, I'm learning RN these days. I'm kinda newbie in this field, so I make this error to issue.

in navigation page, it says
```shell
The playground encountered an error. When you fix the error, the playground will automatically re-run your code.
TypeError: Cannot read properties of undefined (reading 'NavigationContainer') (2)
```

Thank you.