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. 



Here's a few external links directly from the Autodesk website that should help explain this error in detail:

https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/License-server-does-not-start-and-shows-error-15-570.html

https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/Error-15-570-0-A-valid-license-could-not-be-obtained-by-the-network-license-manager.html

https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/FLEXnet-Licensing-error-15570-System-Error-10035.html