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Hi guys I was trying yo implemented the DevCon 2019 Rest Builder example publicated in this page Building an SPA Using the New Headless APIs and REST Builder  https://www.liferay.com/es/web/events-devcon-recap    and this video https://www.youtube.com/watch?v=ZxJCiL-LEr8 , but I got stuck when I want to test the API in PostMan, because when I send the petition this is the response
I am working with  liferay-dxp-7.2.10.1 and the code is below
rest-open-apicomponents:
    schemas:
        Appointment:
            description: Represents an appointment.
            properties:
                date:
                    format: date-time
                    type: string
                id:
                    format: int64
                    type: integer
                title:
                    type: string
            type: object
info:
    description: ""
    license:
        name: "Apache 2.0"
        url: "http://www.apache.org/licenses/LICENSE-2.0.html"
    title: "Appointments"
    version: v1.0
openapi: 3.0.1
paths:
    "/sites/{siteId}/appointments":
        get:
            operationId: getSiteAppointmentsPage
            parameters:
                - in: path
                  name: siteId
                  required: true
                  schema:
                      format: int64
                      type: integer
            responses:
                200:
                    content:
                        application/json:
                            schema:
                                items:
                                    $ref: "#/components/schemas/Appointment"
                                type: array
                        application/xml:
                            schema:
                                items:
                                    $ref: "#/components/schemas/Appointment"
                                type: array
                    description: "Get appointments"
            tags: ["Appointment"]
Java CodeImplpublic class AppointmentResourceImpl extends BaseAppointmentResourceImpl {
    
    
    @Override
    public Page<Appointment> getSiteAppointmentsPage(
            @NotNull Long siteId) throws Exception {
        // TODO Auto-generated method stub
        List <Appointment> appointmentList = new ArrayList<>(10);
        
        for (int i = 0; i < 10; i++) {
            Appointment appointment=new Appointment();
            appointment.setId((long)i);
            appointment.setTitle("Title"+i);
            appointment.setDate(new Date());
            appointmentList.add(appointment);
        }
        
        
        return Page.of(appointmentList);
    }
    
}
Regards