Usually the render service that gets installed with Process Management(system) is called RenderPDFForm (no space).
Are you using the Default action profile on your user step? Can you verify which render service it is using and make sure there is no space?
Yes, I'm using RenderPDFForm; One of the supplied parameter(resourceURI) was wrong which caused the issue.
Now it is working fine.
Thanks for the reply jasmine.
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