Please let us know how to resolve this error.

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Thanks for your question. Usually when you receive that error message you just need to start the license server.
- In LMTOOLS, click the Start/Stop/Reread tab > Start Server.
- or Start the FLEXnet server by opening a command line on the FLEXnet server while in the FLEXnet folder and typing: lmgrd -c license.lic Please view our "Network Installation Setup" at step#12, https://support.numericalinnovations.com/support/solutions/articles/14000026042-fab-3000-network-installation-setup-
Here's a few external links directly from the Autodesk website that should help explain this error in detail:
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