VSTS Extension build summary section

I have added a custom summary section to "Build Summary" section through a VSTS extension.

I'm getting following error in VSTS Build summary section on build completion.

"VSTS Extension by ABC failed to load.Learn More about this extension, including available support options."

Contribution:

        "id": "abcfef-build-status-section",
        "type": "ms.vss-build-web.build-results-section",
        "description": "ABC Scan Summary",
        "targets": [
            ".build-info-tab",
            "ms.vss-build-web.build-results-summary-tab"
        ],
        "properties": {
             "name": "ABC Summary Section",
             "uri": "buildstatus.html",
             "order": 20,
             "height": 500
        }

Scope:

    "scopes": [
  "vso.build",
  "vso.build_execute"
]

Html page (buildstatus.html):

 <!DOCTYPE html>
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
     <title>Hello World</title>
     <script src="scripts/VSS.SDK.js"></script>
 </head>
 <body>
     <script type="text/javascript">VSS.init();</script>
     <h1>Hello World</h1>
     <script type="text/javascript">VSS.notifyLoadSucceeded();</script>
 </body>
 </html>

Please help to resolve this.

Thanks in advance.

Solution

I found the issue by analyzing console logs of Chrome browser. It seems my organization firewall is blocking the API call to retrieve resources. :)

https://xxxxxxxx.gallery.vsassets.io/_apis/public/gallery/publisher/xxxxxxxxxxxxxxxxxxxxxxxx=/Extension/status.html Failed to load resource: net::ERR_CONNECTION_CLOSED

Thanks-