Error using actions-on-google Carousel or List with dialogflow's WebhookClient

Question

I tried everything to get this example working (In particular the Carousel part). Every time I try to use List or Suggestions or Carousel from actions on google, it gives me in the google simulator this error: error from actions on google simulator

Here's the Intent code from my heroku webhook (it's copy paste from the example)

function prova(agent){
let conv = agent.conv();
const imageUrl = 'https://developers.google.com/actions/images/badges/XPM_BADGING_GoogleAssistant_VER.png';
const imageUrl2 = 'https://lh3.googleusercontent.com/Nu3a6F80WfixUqf_ec_vgXy_c0-0r4VLJRXjVFF_X_CIilEu8B9fT35qyTEj_PEsKw';
const linkUrl = 'https://assistant.google.com/';

conv.ask(new Carousel({
  title: 'Google Assistant',
  items: {
    'WorksWithGoogleAssistantItemKey': {
      title: 'Works With the Google Assistant',
      description: 'If you see this logo, you know it will work with the Google Assistant.',
      image: {
        url: imageUrl,
        accessibilityText: 'Works With the Google Assistant logo',
      },
    },
    'GoogleHomeItemKey': {
      title: 'Google Home',
      description: 'Google Home is a powerful speaker and voice Assistant.',
      image: {
        url: imageUrl2,
        accessibilityText: 'Google Home'
      },
    },
  },
}));
agent.add(conv);
}

So, here's my dependencies:

package.json dependencies

Anyone who has already solved this issue? I didn't find anything on this...

Thank you in advance!

Answer 1

In your implementation you missed a line from the original example. You need to have a SimpleResponse before your carousel. So you would need a line such as

conv.ask('Please choose an item:');

on the line before the conv.ask() for the new Carousel.