I have a game in heroku, now I'm trying to make it work in Facebook canvas, but, while it works in Firefox, in Chrome and IE doesn't.
IE shows a warning with a button, when clicking the button, it shows the content.
In chrome, I get this error:
Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('https://game.herokuapp.com') does not match the recipient window's origin ('null').
What's wrong?
Make sure the target window that you (or Facebook) is posting a message to, has completed loading. Most of the times I've gotten this error were when an iframe I was sending messages to had failed to load.