Theme doesnt work in Vaadin Designer

Hi.
We have created a Vaadin 8.4 Spring application and I have a problem with the Theme.
In Vaadin Designer it does not show the Theme, however in execution it works (the default theme Valo if it takes it in the Designer phase - it is as if it did not find the theme).
Does anyone know if there is any configuration of the project, setting file to change, pom, etc.?
The funny thing is that a colleague works perfectly and the only difference I think we have is that in the POM the name of my project is different with the one that created the project and I do not know if there is something that has been “pending” to change when doing the renaming.

Thank you very much, and sorry for the English.

This issue was also discussed in [forum in Spanish]
(https://vaadin.com/forum/thread/17071115). I’ll leave the English answer just for future reference.

Issue was fixed after reviewing that the project configuration looked like the configuration in this sample project: