App not loading API definitions

[Mu4h4h4]

Hello @msschroe3,
Thank you very much for this sample project!

I'm running into the issue below when starting up this project ./gradlew bootRun, no changes at all.
Any ideas what could be the problem?

Thank you very much for your time in advance!

Failed to load API definition.
Failed to execute 'fetch' on 'Window': Failed to parse URL from http://localhost:8080undefined http://localhost:8080undefined