Ion REST: Invalid Parameter: 'type' must be a valid asset type

Here’s my code:

const ortoIonBody = {
    description:'some desc',
    options: {

  const ortoResponse = fetch('', {
    headers: {
      Authorization: `Bearer ${ionToken}`
    method: 'POST',
    json: true,
    body: ortoIonBody
  .then(response => response.json())
    .then(json => console.log(json))

Here’s is my code from console:

What is the problem? I’m using types from REST API doc. When I try get asset list it’s work. Ion token has all permisions.