HtmlResponse is not supported on this device

Question

I have developed interactive canvas application and it was working fine with devices having display.

Suddenly when I checked it today it says "Application is not responding, try again later.". When I checked in test simulator and gone through debug I have received following error printed in debug.

"sharedDebugInfoList": [
  {
    "name": "ResponseValidation",
    "debugInfo": "",
    "subDebugEntryList": [
      {
        "name": "MalformedResponse",
        "debugInfo": "expected_inputs[0].input_prompt.rich_initial_prompt.items[1].html_response: HtmlResponse is not supported on this device..",
        "subDebugEntryList": []
      }
    ]
  }
],

It was working and users were using it in their mobile device, but this sudden error made me blind to understand it. I have not made even 1 line of change in my code. I have even checked cloud logs and there is nothing. Here is what I am doing when user enters in my action.

app.intent('welcome', (conv) => {
    console.log('capabilities = ',conv.surface.capabilities)
    if (!conv.surface.capabilities.has('actions.capability.SCREEN_OUTPUT')) {
        conv.close('Sorry, this device does not support Interactive Canvas!');
        return;
    }
    conv.ask(`Welcome! Let's start the game`);
    conv.ask(new HtmlResponse({
       url: '<url of my website having interactive canvas support>',
    }));
});

Here is the action that I am facing error.

Answer 1

The action seems to be working ok for me.

The most common reason I've seen for it not working is that the category wasn't set to "Games & Fun" (or was cleared for some reason) or the Interactive Canvas checkbox wasn't set.

To make sure you are still in the "Games & Fun" category, go to the Actions Console, the "Deploy" tab, and the "Directory" information.

Then, towards the bottom of that same page, make sure you have the Interactive Canvas checkbox set.