Failed to execute ‘postMessage’ on ‘DOMWindow’: !== http://localhost:9000

This is the error message that I get: Failed to execute ‘postMessage’ on ‘DOMWindow’: The target origin provided (‘’) does not match the recipient window’s origin (‘http://localhost:9000′). I’ve seen other similar problems where the target origin is and the recipient origin is, but none like mine where the target is and the … Read more