VS402881: No artifact version is specified corresponding to artifact source 'MyBuild.' Release Management vNext REST API

I'm using TFS 2015.2 RTM and I just found out that the Release Management vNext REST API is in 2.2-preview.1 on-premises. I want to create a release, but I don't know the exact JSON to put in the body of the POST request since the documentation only works for VSTS.

When I send the request, I get the error message:

VS402881: No artifact version is specified corresponding to artifact source 'MyBuild.' Specify a valid value and try again. 

Here's the JSON:

$body = @"
     {
          definitionId": 1,
    "description": "test",
    "artifacts": [ 
      {
         "alias": "Tailspin Toys", 
         "version": {
               "id": 147,
         },
         "instanceReference": {
            "id": 5
        }
       }
     ]
} 
"@

And here's the Invoke-RestMethod command:

$releaseResponse = Invoke-RestMethod -Method Post -Credential $credential -ContentType application/json -Uri $postUri -Body $body

What JSON items am I missing? How do I find what to put in the JSON body if the docs don't have what is missing?

Yes there are some disparities between the current version of VSTS APIs and the TFS 2015.2 APIs. But most of the APIs should work except a very few. Here is the documentation link.

Following is the required JSON for creating a release. The required JSON needs to have the name in instanceReference although its optional for the current version of VSTS API.

{
  "definitionId": 1,
  "description": "test",
  "artifacts": [
    {
      "alias": "Tailspin Toys",
      "instanceReference": {
        "id": "5",
        "name": "<build_name>"
      }
    }
  ]
}