Fleet is probably jetbrains' worst development tool.

I'm sorry about the problem. It looks like there are some issues with the classpath (no Java main class is provided). Do you run Spring boot project from the green arrow on the left gutter in Editor? Can you post the full textual output from Run tool window where you are getting this error?

Do you use Maven or Gradle in project? It would help if you could share a sample project to reproduce.

For uploading you can use https://uploads.jetbrains.com Thank you.