This will occur when no path to the workers is specified in the user's configuration and they are not on the path. To resolve this issue, make sure the path to the workers is added to the user's configuration:
1. In MATLAB, go to the Parallel menu, then to Manage Configurations.
2. Double-click on your Torque configuration.
3. In the "Scheduler" tab, if "Root directory of MATLAB installation for workers (CluserMatlabRoot)" if set to "Workers are on the path", try selecting "<Custom Value>" and enter the full ClusterMatlabRoot path.
4. Click "OK" and run validation again.
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