Creating Envelope Rest API Failure

[PavanKumarH]

Hello I am getting the following error when I try to create an envelope

{
  "errorCode": "INVALID_REQUEST_BODY",
  "message": "The request body is missing or improperly formatted. Cannot deserialize the current JSON object (e.g. {\"name\":\"value\"}) into type 'API_REST.Models.v2.document[]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.\r\nTo fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.\r\nPath 'documents.documentId', line 1, position 74."
}

SO docusign can't parse a json string in maven set up. Below is my json string passed as a Post Api body:

{"status":"sent","emailSubject":"Test","documents":{"documentId":"1","name":"TestPDF.pdf","documentBase64":"Actual encoded document will be passed here"},"recipients":{"signers":{"name":"Pavan Palegar","email":"pavankumar.hanumantharaya@yahoo.com","recipientId":"12","clientUserId":"12345","tabs":{"signHereTabs":{"documentId":"1","xPosition":100,"yPosition":525,"pageNumber":5}}}}}

I have followed the exact documentation as below:
https://www.docusign.com/developer-center/explore/features/embedding-docusign

Kindly, let me know what do you make of it.
Thanks