An error has occurred :-(

Usual error causes

  1. You started the application from an IDE and you didn't run npm start or npm run webapp:build.
  2. You had a network error while running npm install. If you are behind a corporate proxy, it is likely that this error was caused by your proxy. Have a look at the error logs, you will probably have the cause of the error.
  3. You installed an inappropriate Node.js : please use an LTS (long-term support) version, as it's the only version we support.