Nilay Pedram
Forum Moderator

Hello,
Thank you for reaching out to the Ansys Learning Forum.

You can follow these threads for better understanding of the problem.
Ansys.Fluent.Cortex.CortexNotAvailableException error
Error: Exception of type ‘Ansys.Fluent.Cortex.Cortex not availableException’ was thrown

For more information, please refer to Fluent User's Guide - 40.1. Introduction to Parallel Processing (ansys.com)

If you are not able to access the above link, please follow this forum discussion - How to access the ANSYS Online Help

Hope this helps you. Thank you!