Charts trial license invalid

After registering and downloading a Vaadin Charts trial license, compiling the dash-board demo from https://github.com/vaadin/dashboard-demo results in " License for Vaadin Charts 4 is not valid. Get a valid license from vaadin.com/pro".

Hi. Master of dashboard demo is running Vaadin Framework 8 alpha with Vaadin Charts 4 alpha. Did you mean to use that or did you want Vaadin Framework 7 (stable release)? New trial licenses is still created for the stable version, Charts 3. If you want Framework 7, take the 7.7 branch https://github.com/vaadin/dashboard-demo/tree/7.7. 

I will try to make sure that trial licenses in the future work for any major version. In the mean time, if you actually want to test Vaadin Framewrok 8, I can manually edit your trial license to be for Charts 4. Just give me a heads up.

Hi again.
As my first encounter with Vaadin, I simply wanted to see it in action, hence 7.7 is fine.

I build from the 7.7 branch, unfortunately only a spinner appears followed by

Failed to load the widgetset: ./VAADIN/widgetsets/com.vaadin.demo.dashboard.DashboardWidgetSet/com.vaadin.demo.dashboard.DashboardWidgetSet.nocache.js?1479497138408 

From the log:

com.vaadin.server.VaadinServlet serveStaticResourcesInVAADIN

INFO: Requested resource [/VAADIN/widgetsets/com.vaadin.demo.dashboard.DashboardWidgetSet/com.vaadin.demo.dashboard.DashboardWidgetSet.nocache.js] not found from filesystem or through class loader. Add widgetset and/or theme JAR to your classpath or add files to WebContent/VAADIN folder.

Update: This was solved compiling the widgetset with Maven as below. I had expected following the build instructions
​to be enough.

mvn vaadin:compile

Great that you got it solved. I will see to it that someone updates the project structure so that you do not have to manually type that, or then explicitly say it in readme. 

May I ask what command did you run the first time to get that issue? mvn install? mvn jetty:run?

Thanks.

I ran

mvn -P production-mode jetty:run

as per how I understood the instructions in https://github.com/vaadin/dashboard-demo#running-the-app