Error while Inserting Data using Rest API in Zoho Catalyst

I want to insert a record in the Catalyst Datastore table using Rest API. But while inserting the records in table I'm facing an issue of invalid input.

Details which I'm using to insert a record into the table:

1. "scope": "ZohoCatalyst.tables.rows.CREATE"

2. API url : "https://api.catalyst.zoho.com/baas/v1/project/project_id/table/table_identifier/row"

3. A row of JSON data that passed as a request body.

   {"customer_id": 1001,"customer_name": "Guru","Designation": "Tester"}

4. The error response that I'm getting while invoking the insert API.

   {"status": "failure","data": {"message": "The input value is not readable. Please check your input","error_code": "INVALID_INPUT"    }}