There are multiple reasons why you might be receiving this error:
1. This message usually indicates that you are trying to use a product for which you are not licensed. You can look at your license.lic file located within your MATLAB installation to see if you are licensed to use this product.
To determine where your license file is located, please refer to the following article:
Where are the license files for MATLAB located?
NOTE: If you only have a network.lic file, instead of a license.lic file, you are using a network license. In this case contact your license administrator to check the license.dat file on the License Manager server machine.
2. If you are licensed for this product, this error may be the result of formatting problems in your license file. In order to avoid this, ensure that the following strings all begin on a left justified line: #, SERVER, DAEMON, or INCREMENT. Sometimes an INCREMENT line can get wrapped on the end of the preceding INCREMENT line causing it to be omitted.
You can also simply re-activate MATLAB on this system. That will automatically update the license file on your system.