Getting Internal Server Error (500) while making Post call to REST API using REST POST Snap- XML Payload

I am trying to post XML payload to a REST API using REST POST Snap but getting Internal Server Error (500) as response. I am also using Basic Authentication REST account in the REST Snap for authentication purpose. However, Using Postman I am getting 200 OK as response.
Screenshot of pipeline:


Pipeline Export:
test_2019_12_07.slp (8.2 KB)
Please help.