First of all I would like to thank you for all your superb Add-ons.
This one seems to have a packaging problem because I get following errors by just adding the dependency to the pom:
o.a.c.c.C.[Tomcat]
.[localhost]
.
[/] : Exception sending context initialized event to listener instance of class [com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener]
java.lang.IllegalStateException: Running project in development mode with no access to folder '/Users/jean-christophe/Documents/vaadin-addon/custom-media-query'.
Build project in production mode instead, see https://vaadin.com/docs/v14/flow/production/tutorial-production-mode-basic.html
...
o.s.boot.SpringApplication : Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
Am I doing something wrong?