swagger - データが「oneOf」のスキーマと一致しません - エラー

Question

Swagger オンライン エディターで次のエラーが発生しています。 データが「oneOf」のスキーマと一致しません

'/tenants/tenant_id/groups/group_id':
get:
  description: 'Returns the group with specific id ( id, name, description, tenant_id... ) along with end point pools ( id, name, description, source, tenant_id... ) associated with this particular groups'
  operationId: getGroupWithKey
  consumes:
    - application/json
    - text/plain, */*
  produces:
    - text/xml
  parameters:
    - in: header
      name: 'X-AuthToken'
      description: authentication token obtained during login
      required: true
      schema:
        $ref: '#/definitions/token_string'
  responses:
    '200':
      description: OK (group with provided id received)
      schema:
        $ref: '#/definitions/getGroupWithKey'
    default:
      description: error
      schema:
        $ref: '#/definitions/errorModel'

definitions:
### Login Definitions ###      
  token_string:
    type: object
    required:
      - 'X-AuthToken'
    properties:
      X-AuthToken: 
        type: string

エラーは、「parameters」で始まる行である行 206 を指すとおりです。

✖ Swagger Error

Data does not match any schemas from 'oneOf'   
Jump to line 206
Details
Object
code: "ONE_OF_MISSING"   
message: "Data does not match any schemas from 'oneOf'"
path: Array [5] 
0: "paths"
1: "/tenants/tenant_id/groups/group_id"
2: "get"
3: "parameters"
4: "0"
inner: Array [2]
0: Object
code: "ONE_OF_MISSING"
message: "Data does not match any schemas from 'oneOf'"
path: Array [5]
inner: Array [2]
1: Object
code: "OBJECT_MISSING_REQUIRED_PROPERTY"
message: "Missing required property: $ref"
path: Array [5]
level: 900
type: "Swagger Error"
description: "Data does not match any schemas from 'oneOf'"
lineNumber: 206

定義中の type: string を変更しようとしましたが、まだ運がありません。ここで適切な型の値が欠落していると確信しています。助けていただければ幸いです

ありがとうございます