Not able to mount standalone react application using npm

[Shoaib20-1998]

I a have created react spa standalone but when i m trying to mount it on single spa playground to check whether is working or not but its throwing this error :-

Uncaught Error: application '@project/dashboard' died in status LOADING_SOURCE_CODE: Error loading https://localhost:8500/project-dashboard.js (SystemJS Error#3 https://github.com/systemjs/systemjs/blob/main/docs/errors.md#3)
at HTMLScriptElement. (system.js:662:18)Understand this errorAI

this is the url i m hitting:-
http://single-spa-playground.org/playground/instant-test?name=@project/dashboard&url=8500

webpack.js:-

module.exports = (webpackConfigEnv, argv) => {
  const defaultConfig = singleSpaDefaults({
    orgName: "project",
    projectName: "dashboard",
    webpackConfigEnv,
    argv,
  });

  return merge(defaultConfig, {
    // modify the webpack config however you'd like to by adding to this object
  });
};

port :- "start": "webpack serve --port 8500",

anyone please help if you have solution to this