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 

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 origin is http://localhost:9000.

  1. I don’t get the problem. What is the problem?
  2. How can I fix it?

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