|OS type and version||Centos 7|
|Virtualmin version||7.1 Pro|
" Warning! A problem was detected with your Virtualmin license :
Your serial number 5598210 is licensed for only 1 server, but is being used on 3. Unless this serial number is used temporarily in order to migrate to a new server, you must purchase an additional license at Virtualmin Shop to preclude violation of the rules of service and avoid early termination of the existing license."
The license installation script is used on a single server for the last two months.
What is this notice about?