Getting JsonSerializationException Error after completing the Client Security Hash Assignment

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Hi…

I have completed my Client Security Hash Assignment, it is working fine. But it is throwing following exception after completing the execution.

error-7th%20june
error-7th%20june1124×595 38.5 KB

In the screenshot you can see that no system error was thrown and it executed properly.
Please help as this is the only issue I am facing now.

Thanks,
Prachi