Make sure the license daemon is running on the server. Then, consider the following cases:
Case one: As a workaround, ignore the present messages and get an upgrade to 2.1c or above.
Case two: To check for a misassigned license, run the command hostid(1). Your hostid is displayed.
Next, run the command fw printlic to see output similar to the following:
This is FireWall-1 Version 2.1 Type Expiration Features id-649f152b never stdlight