Could not parse document, Error: missing start tag

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3

I did come across the Cross-Origin error when I was using:
xhr.open(‘GET’, ‘https://demo.bpmn.io/bpmn/diagrams/pizza-collaboration.bpmn’, true);
and looked in to CORS for the same.

But I also tried saving the bpmn(used different bpmns as well) locally and tested it with:

   viewer.importXML("diagram.bpmn", function(err) {
      if (!err) {
        viewer.get('canvas').zoom('fit-viewport');
      } else {
        console.log('something went wrong:', err);
      }
    });

Also tried:

   viewer.importXML("./diagram.bpmn", function(err) {...} // note the ./

With the same error, but without the Cross-Origin error.