If you were given a trial license, make sure that there are at least 16 seats on the license. Having less than 16 will result in this error.
If you are trying to use Online Licensing
Make sure there are enough seats on the license to do what you're trying to do with the product in question. For example, if you're using MATLAB Parallel Server, make sure you have enough workers to perform the job you're trying to run.
If you are not trying to use Online Licensing
This issue can occur if you have USE_ONLINE_LICENSING set to "true" in the mjs_def file when you are trying to use a MATLAB Job Scheduler cluster with a Network License Manager. The mjs_def file is located in the below directory:
MATLABROOT\toolbox\parallel\bin
This issue will occur even if all of the workers in your cluster are able to successfully checkout a license testing with -dmlworker, and the client is able to successfully checkout a Parallel Computing Toolbox license. The license error from attempting to use online licensing will cause a failure over the successes.
Remove the online licensing specification in the mjs_def, restart mjs on all of the workers and headnode, and then you should be able to validate afterwards.
