Session Not Found error when creating a service from request and response pairs in the DevTest Portal

Document ID : KB000117840
Last Modified Date : 30/11/2018
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Issue:
While creating a virtual service from request and response pairs in the DevTest Portal 10.4, I am getting the error "Session Not Found" when I try to save the VS.
Environment:
Issue faced with DevTest 10.4.
Cause:
The issue was that the JSON request file was not in a valid JSON format.
Resolution:
If there is any doubt regarding the JSON payload please search for a JSON validator to check the format of the payload being used.