This error gets logged in a distributed environment when the license.slave server tries to contact his license.master and the license info has already rolled over. Or on the license.master if the time on the license.master server is set behind the license.slave, as it should manage the roll over time for itself and the slave(s).
See http://docs.splunk.com/Documentation/Splunk/latest/Admin/Groups,stacks,pools,andotherterminology
Typical issues are timezone issues [license.slave(s) not being on the same time as license.master] or communication or the clocks not being set correctly.
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