SAP Conversational AI Webhook List response

Hello Experts,

I'm new to SAP conversational AI. but i'm really excited for my first bot.

i have webhook that should return a list to the bot. as i understood from the documents i should return something like this. {

  "replies": [
    {
      "Type": "list",
      "content": {
        "elements": [
          {
            "title": "CreatedBy",
            "imageUrl": "link here",
            "subtitle": "Basel",
            "buttons": []
          }
        ],
        "buttons": []
      }
    }
  ]
}

but i'm facing this on the bot

and the memory is:

{
  "nlp": {
    "uuid": "729bf813-4dc9-42cf-95c1-518bc3a1774b",
    "intents": [
      {
        "slug": "queryticket",
        "confidence": 0.99,
        "description": "Ask for A Specific Ticket"
      }
    ],
    "entities": {
      "tid": [
        {
          "value": "1575088166542",
          "raw": "1575088166542",
          "confidence": 0.64
        }
      ]
    },
    "language": "en",
    "processing_language": "en",
    "version": "1909.0.3",
    "timestamp": "2019-11-11T19:35:21.473540+00:00",
    "status": 200,
    "source": "search ticket 1575088166542",
    "act": "command",
    "type": null,
    "sentiment": "neutral"
  },
  "qna": {},
  "messages": [
    {
      "Type": "list",
      "content": {
        "elements": [
          {
            "title": "U_CreatedBy",
            "imageUrl": "https://image.shutterstock.com/image-photo/colorful-flower-on-dark-tropical-260nw-721703848.jpg",
            "subtitle": "Basel",
            "buttons": []
          }
        ],
        "buttons": []
      }
    }
  ],
  "conversation": {
    "id": "test-1573500875239",
    "language": "en",
    "memory": {
      "TicketNumber": {
        "value": "1575088166542",
        "raw": "1575088166542",
        "confidence": 0.64
      }
    },
    "skill": "searchticket",
    "skill_occurences": 1
  },
  "logs": {
    "input": "search ticket 1575088166542",
    "logs": [
      {
        "level": "info",
        "code": "I_SKILL_TRIGGERED",
        "data": {
          "skill_id": "09357818-14e8-48a3-b881-dad2df48b567",
          "reason": "TRIGGERS_OK",
          "message": "skill searchTicket has been triggered"
        },
        "timestamp": "2019-11-11T19:35:21.000Z"
      },
      {
        "level": "info",
        "code": "I_REQUIREMENT_FULFILLED",
        "data": {
          "requirement_id": "6440f0bd-9278-4c4a-bb9a-0dc3d40c7c21",
          "requirement_name": "TicketNumber",
          "value": {
            "value": "1575088166542",
            "raw": "1575088166542",
            "confidence": 0.64
          },
          "message": "requirement TicketNumber has been fulfilled with {\"value\"=>\"1575088166542\", \"raw\"=>\"1575088166542\", \"confidence\"=>0.64}"
        },
        "timestamp": "2019-11-11T19:35:21.000Z"
      },
      {
        "level": "info",
        "code": "I_REQUIREMENTS_OK",
        "data": {
          "skill_id": "09357818-14e8-48a3-b881-dad2df48b567",
          "message": "requirements of skill searchTicket validated, executing actions"
        },
        "timestamp": "2019-11-11T19:35:21.000Z"
      },
      {
        "level": "info",
        "code": "I_EXECUTE_ACTION",
        "data": {
          "type": "http",
          "value": {
            "messages": [
              {
                "Type": "list",
                "content": {
                  "elements": [
                    {
                      "title": "U_CreatedBy",
                      "imageUrl": "https://image.shutterstock.com/image-photo/colorful-flower-on-dark-tropical-260nw-721703848.jpg",
                      "subtitle": "Basel",
                      "buttons": []
                    }
                  ],
                  "buttons": []
                }
              }
            ],
            "fallback": null
          }
        },
        "timestamp": "2019-11-11T19:35:26.000Z"
      }
    ]
  },
  "hasDelay": true,
  "hasNextMessage": false
}

can anyone tell me what is it i'm doing wrong?

thanks in advance.