This error code means that your product key is no longer valid. It has likely been replaced at some point by an SMA renewal.
You need to log into your account here: https://licenses.fotoware.com/licenses
Now click on the Licenses in the top banner to retrieve your product key. If the key that is there is the same as the one you are trying to activate, then go to the Agreements tab. It is possible that you have an SMA that is ready for fulfillment.
After fulfilling your SMA, a new key will be delivered to the primary contact person associated with the SMA (you can see who on the Agreements tab).
New licenses will also be available under Licenses once they're issued.