API Code is not loading correctly on site?

I am using the code snippet from the Document Service PDF embed API service, which is not working correctly on my end.

I am getting the following error:

Here is the code I am using:

<script src="https://documentcloud.adobe.com/view-sdk/main.js"></script>
<script type="text/javascript">
	document.addEventListener("adobe_dc_view_sdk.ready", function(){ 
		var adobeDCView = new AdobeDC.View({clientId: "6d2b4b4b70c64a0c9b71a2fed484e645"});
		adobeDCView.previewFile({
			content:{location: {url: "http://www.corclinic.com/downloads/COR_PhxMag_reprint_0408.pdf"}},
			metaData:{fileName: "COR_PhxMag_reprint_0408.pdf"}
		}, {embedMode: "LIGHT_BOX"});
	});
</script>

Can the source PDF be from any website, or does it have to be stored on the adobe cloud for this work? Thank you