Hello,
It seems that the Vaadin google-maps add-on which is used in CUBA uses old Google Maps API version.
I’ve created an issue that you can track.
Also, I want to clarify, is MapViewer not working at all or only JavaScript warning is showing?
Best regards,
Daniil.
MapViewer was not working not all. However it turned out be unrelated with above mentioned javascript warning. It was some maps api key usage issue and I have got it resolved now. MapViewer happily working now.