Getting 400 Bad Reques “Request body is empty or format is invalid”

Its for the Virtualization client and I’m just trying to create a new client.  Should be pretty simple.

POST {{ServerUrl}}/Client

This is in the example call for POSTMAN and not working.  Anyone know what is wrong?

{

    "clientInfo": {

        "clientType": 12,

        "virtualServerClientProperties": {

            "virtualServerInstanceInfo": {

                "vsInstanceType": {{vsInstanceType}},

                "associatedClients": {

                    "memberServers": o

                        {

                            "client": {

                                "clientName": "{{clientName}}"

                            }

                        }

                    ]

                },

                "vmwareVendor": {

                    "vcenterHostName": "{{vcenterHostName}}",

                    "virtualCenter": {

                        "password": "{{base64encodedPassword}}",

                        "userName": "{{UserName}}"

                    }

                }

            }

        }

    },

    "entity": {

        "clientName": "{{clientName}}"

    }

}