My project has over 20 packages and at least 3 files in each package, it will take a lot of time to remake them
Well at least now we can rule out anything globally on your system and it has to be within your app 
Can you check if you see the full stack trace of your exception from your origin build? If there is no exception visible, running with -X could show some more debug information (carefully spamful)
Why is asking for a licence ?
Now seem to work on my copy-of-copy project. let me try on main
so, why does it asks for a licence when I build it for production ?
Do you have “vaadin” as dependency instead of “vaadin-core”?
yes, I had just “vaadin”
oh, thank you, you’re awesome !
At least it works now 