Nothing displaying when running the app

when I walked through the code base I couldn't find ControlDescription and ControlEvalError modules so it gives me an error.
can you guide me, please?

I've encountered the issues you're describing before. One potential solution is to ensure that all dependencies have been successfully downloaded. I resolved a similar issue by navigating to the menu "File" -> "Invalidate Caches/Restart" and then reloading all Maven projects.
Regarding the problem of nothing displayed, you can navigate to "main/webapp/README.md", where you'll find a "run" button to execute "npm install" and install dependencies from the npm repository.
I hope this information proves helpful to you!