This error message is related features included into the Usb key.
Open the web page http://localhost:1947 and you'd see the following :
Select "Sentinel key" from the left menu and you'd see the list of the key:
If your key is missing, unplug and plug it again on a different port.
Select "Features" of your key and you'd see the following product:
If not your key could not be updated to your latest version. Please take a screenshot of the features list and contact Technical Support (support@domus3d.com).
This article is valid for DomuS3D® 2017 and later versions