Show Live: Failed to execute 'postMessage' on 'DOMWindow'


I remixed the “Trello Card Snooze Power-Up” gitch, but when I try the Show Live button, I get a new tab and the blue loading screen for a moment then a blank page. The developer tools console log shows:

Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('') does not match the recipient window's origin ('').

Tried in Chrome 66 on Linux, MacOS and on Firefox on Linux. Same result on each.

The same happens if you view the original project too. This doesn’t look like a problem with Glitch, I think it’s because the intent of the app is you view it within the Trello app. Do you still get the same issue if you follow the steps in the readme? If so, check with the Trello team on the cause.