Hardware key not installed

Error in debug log file:

9:03:05 (ESRI) The Sentinel SuperPro hardware key has not been installed

on this system, or has been removed.

9:03:34 (ESRI) daemon shutdown requested - shutting down

9:03:35 (lmgrd) SHUTDOWN request from SYSTEM at node SERVERNAME

9:03:35 (lmgrd) lmgrd will now shut down all the vendor daemons

9:03:35 (lmgrd) Shutting down ESRI

 Cause:

Solution: