Callbacks definition gives console error

Hi,

Here is the definition snippet that causes the issue :

  /realtime/events:
    post:
      summary: 'Souscrire aux évènements en temps réel, via des webhooks'
      description: |
        Souscrire aux évènements en temps réel, via des webhooks.
      tags:
        - Device
        - Webhook
        - IoT
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties: false
              required:
                - callbackUrl
                - targetAssets
                - jwt
              properties:
                callbackUrl: # Callback URL
                  type: string
                  format: uri
                  example: https://myserver.com/send/callback/here
                targetAssets:
                  description: Identifiants des Assets pour lesquels il faut transmettre les données.
                  type: array
                  items:
                    type: string
                jwt:
                  type: string
                  description: JSON Web Token fourni par l'application métier afin que le serveur puisse authentifier les requêtes de callback.
      responses:
        '201':
          description: Webhook created
      callbacks: # Callback definition
        alarmEvent: # Event name
          '{$request.body#/callbackUrl}': # The callback URL
            post:
              requestBody: # Contents of the callback message
                required: true
                content:
                  application/json:
                    schema:
                      oneOf:
                        - type: object
                          additionalProperties: false
                          properties:
                            code:
                              type: number
                              description: Code d'erreur
                            message:
                              type: string
                              description: Message d'erreur
                        - type: object
                          description: Objet technique
              responses: 
                '200':
                  description: Your server returns this code if it accepts the callback

And a screenshot