If you check the network tab of your browser you will see it’s trying to load:
That file does not exist:
https://startling-sable-002dc6.netlify.app/index.pck
To fix, you would make sure the file does exist in the location it’s being requested from.
You can use the Deploy file browser to see what you’ve deployed.
You restructure your project so that it produces a single folder than can be served.
You won’t be able to serve anything in a directory higher than the Publish directory.