An error has occurred :-(

Usual error causes

1. You started the application from an IDE and you didn't run npm start

Building the client side code again

If you want to go fast, run ./gradlew to build and run everything.

If you want to have more control, so you can debug your issue more easily, you should follow the following steps:

1. Install npm dependencies with the command npm install
2. Build the client with the command npm run webapp:build or npm start
3. Start the server with ./gradlew or using your IDE