Select error: (Type error) : window.Vaadin.Flow.selectConnector is undefin

Gentlemen, good night.
I’m Carlos from Brazil
I am trying to use the Select component and I get this error:
(Type error) : window.Vaadin.Flow.selectConnector is undefined
Can someone help me?
Thank you

Vaadin 14.1.3

That sounds like a bug. Can you give a short code example of how to reproduce the issue?

Fixed up
I put in the .pom:

com.vaadin vaadin-core

thankful