License for Vaadin Charts 2 is not valid


I recently ran into a problem, I can’t get me head around. Maybe one of you is able to help me.

I download the file vaadin.charts.developer.license and copy the file to my home directory.
then download the project ashboard-demo-master use maven,but unfortunately I am not able to install
the project anymore, getting the following error:

" License for Vaadin Charts 2 is not valid"

Happy New Year!

Where and when did you download vaadin.charts.developer.license ?