VSS.SDK.min.js:2 No handler found on any channel for message:

[AleXSR700]

Hi everyone,

I am building an Azure DevOps Server extension (on-premises, xml process) and the functionality seems fine, but the console is flooding with errors. I suspect it has something to do with the import of SDK, but maybe not.

I have googled and tried different solutions. So far no luck.

Does anybody know what is causing all these handler errors and how to fix it?

Errors:
console.txt

Example files to go with the errors:
ConfigHub.tsx.txt
ConfigHub.html.txt

Loaded in manifest via:

    "contributions": [
		{
        "id": "FieldSentinelConfigHub",
        "type": "ms.vss-work-web.work-item-form-control",
        "targets": ["ms.vss-work-web.work-item-form"],
        "properties": {
            "name": "Field Sentinel ConfigHub",
            "uri": "dist/ConfigHub.html"
        }
		},  

I am happy to supply any file or log anybody might see useful :)

Thank you for your support.
Alex