Element type is invalid after upgrading to 0.42.2

Description

After upgrading from react-native 0.42.1 to 0.42.2 I get the following error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

I am using the following two libraries: react-native-router-flux and react-native-maps

The maps are not active and the error appears right after launch. I tried deactivating react-native-router-flux but the error persists.

I upgraded using the following commands: $ react-native-git-upgrade $ react-native upgrade $ react-native link

After this was not working I also tried to remove node_modules, npm install and relink the libraries, but same behavior.

All went through fine, but as soon as the app starts I don’t see any content but the error. If I dismiss it the page remains white and empty.

Additional Information

• React Native version: 0.42.2
• Platform: both
• Operating System: macOS

[chrisz100]

My node version requires me to use import the following way: import App from './app/index'; instead of import App from './app';

[robcalcroft]

In addition to @chrisz100 's comment, this issue arises as RN adds an app.json file which confuses the import as its ambiguous between the app folder and the app.json file.