Getting Error while using the update Constant Smart Service

I have a requirement needs to update multiple constants with corresponding values. I have a constructive data type which will have the constant name in text and corresponding value. I am using update constant smart service to update the constant. Since i have multiple constants i have configured MNI to the smart service. while running the smart service i am getting the error "The constant specified is invalid or does not exist. Constant ID: null."

Thanks in advance for the suggestions

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