Person:    required:      - name      - children    properties:      name:        type: string      children:        type: array        items:          $ref: '#/definitions/Person'

ValueError: $ref circular references found!

swagger: '2.0'info:  version: 1.0.0  title: Swagger Petstore  license:    name: MIThost: petstore.swagger.iobasePath: "/v1"schemes:- httpconsumes:- application/jsonproduces:- application/jsonpaths:  "/persons":    get:      summary: List all persons      operationId: listPersons      tags:      - persons      responses:        '200':          description: An paged array of persons          schema:            "$ref": "#/definitions/Person"        default:          description: unexpected error          schema:            "$ref": "#/definitions/Error"    post:      summary: Add a person      operationId: addPerson      tags:      - persons      parameters:      - in: body        name: body        required: true        schema:          "$ref": "#/definitions/Person"      responses:        '201':          description: person was created          schema:            "$ref": "#/definitions/Person"        default:          description: unexpected error          schema:            "$ref": "#/definitions/Error"definitions:  Person:    required:    - name    - children    properties:      name:        type: string      children:        type: array        items:          "$ref": "#/definitions/Person"  Error:    required:    - code    - message    properties:      code:        type: integer        format: int32      message:        type: string