问Swagger2.0中的神秘错误

EN

Resolver error
e is undefined

swagger: '2.0'
info:
  description: RESTful API to retrieve Titles Metadata
  version: 1.0.0
  title: Swagger Mystery

host: localhost:8080
schemes:
- https
paths:
  /event:
    get:
      operationId: getEvent
      summary: searches names
      description: |
        Search by names, across all types, or by a specific type.
      produces:
      - application/json
      parameters:
      - in: query
        name: title
        description: name to search for
        required: true
        type: string
      - in: query
        name: start
        required: false
        type: boolean
      - in: query
        name: type
        required: false
        type: string
        description: |
          May be "contest", "partner", "sponsor", or "dancer". If missing, will search for all types.
      responses:
        '200':
          description: search results
# I also don't know why I need to comment these out.
          # content:
          #   application/json:
          #     schema:
          #       type: array
          #       items:
          #         $ref: '#/definitions/Event'
        '400':
          description: bad input parameter
definitions:
  Event:
    type: object
    properties:
      eventType:
        type: string
      id:
        type: integer
        format: int64
      name:
        type: string
      description:
        type: string
      contests:
        type: array
        items: 
          $ref: '#/definitions/Contest'
    required:
    - id
    - name
    - description
    - contests
    - eventType
  Contest:
    allOf:
    - $ref: '#/definitions/Event'
    - type: object
      properties:
        parentEvent:
          type: string
        venue:
          type: string
      required:
      - parentEvent
      - venue
  Dancer:
    allOf:
    - $ref: '#/definitions/Event'
    - type: object
      properties:
        eventInvitationDate:
          type: string
          format: date
        venue:
          type: string
      required:
      - eventInvitationDate
      - venue
  Sponsor:
    allOf:
    - $ref: '#/definitions/Event'
    - type: object
      properties:
        invitationDate:
          type: string
          format: date
        parentEvent:
          type: string
        # commenting out these four lines makes the error go away.
        partners:
          type: array
          items:
            $ref: '#/definitions/Partner'
  Partner:
    allOf:
    - $ref: '#/definitions/Event'
    type: object
    properties:
      invitationDate:
        type: string
        format: date
      parentEvent:
        type: string
      venue:
        type: string
    required:
    - invitationDate
    - parentEvent
    - venue
# two problems:
# 1. Schema error at definitions['Event'].discriminator
#    should be string on line 84 (discriminator:)
# 2. Resolver error:
#    e is undefined
#    (no line number)