30 days dev challenge: day 18

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Hello community, :smiley:

i am reaching out to yall because i found some issues while doing the day 18 challenge :
i modified the schema to this:

openapi: "3.0.0"
info:
    version: 1.1.0
    title: Cosmos
    description: A sample API that retrieves constellations as an example to demonstrate features in the OpenAPI 3.0 specification
    license:
        name: MIT
servers:
    - url: https://2a6e0231-05f5-4028-8571-cbce1dcfb5b5.mock.pstmn.io
paths:
    /cosmos:
        get:
            description: Returns all constellations in this sample dataset
            summary: List all cosmos
            operationId: listCosmos
            tags:
                - cosmos
            responses:
                "200":
                    description: An array of constellations
                    content:
                        application/json:
                            schema:
                                $ref: "#/components/schemas/Cosmos"
                default:
                    description: unexpected error
                    content:
                        application/json:
                            schema:
                                $ref: "#/components/schemas/Error"
    /cosmos/{cosmoId}:
        get:
            description: Returns a constellation based on a single ID
            summary: Info for a specific constellation
            operationId: showCosmoById
            tags:
                - cosmos
            parameters:
                - name: cosmoId
                  in: path
                  required: true
                  description: The id of the constellation to retrieve
                  schema:
                      type: string
            responses:
                "200":
                    description: Expected response to a valid request
                    content:
                        application/json:
                            schema:
                                $ref: "#/components/schemas/Cosmo"
                default:
                    description: unexpected error
                    content:
                        application/json:
                            schema:
                                $ref: "#/components/schemas/Error"
components:
    schemas:
        Cosmos:
            type: object
            required:
                - id
                - name
                - tag
            properties:
                id:
                    type: integer
                    format: int64
                name:
                    type: string
                tag:
                    type: string
        Cosmo:
            type: object
            required:
                - id
                - name
                - tag
                - description
            properties:
                id:
                    type: integer
                    format: int64
                name:
                    type: string
                tag:
                    type: string
                description:
                    type: string
        Error:
            type: object
            required:
                - code
                - message
            properties:
                code:
                    type: integer
                    format: int32
                message:
                    type: string

and i saved the index.yaml but i still get the error and when i send the request to get an array.
i am out of ideas ! Anyone can help with a hint(s)Preformatted text ?
thanks :smiley: