在React git页面上需要帮助

Question

import React from "react";
import ReactDOM from "react-dom";
import "bootstrap/dist/css/bootstrap.min.css";
import Router from "./components/Router";
import * as serviceWorker from "./serviceWorker";

ReactDOM.render(<Router />, document.getElementById("root"));

serviceWorker.unregister();

我已经部署了我的应用程序来做出反应，但是它只是在白屏显示我在做什么错。我已经将习惯和应用程序也更改为。我也使用了路由器来HashRouter，而不是BrowserRouter。

//Package json

{
  "name": "react-movie-world-app",
  "version": "0.1.0",
  "private": true,
  "homepage": "https://myusername.github.io/myappname",
  "dependencies": {
    "bootstrap": "^4.3.1",
    "react": "^16.8.6",
    "react-bootstrap": "^1.0.0-beta.9",
    "react-dom": "^16.8.6",
    "react-router-dom": "^5.0.1",
    "react-scripts": "3.0.1"
  },
  "scripts": {
    "predeploy": "npm run build",
    "deploy": "gh-pages -d build",
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "gh-pages": "^2.0.1"
  }
}

//Router js file

import React from "react";
import { HashRouter, Switch, Route } from "react-router-dom";
import App from "../App";
import Contact from "./Pages/Contact";
// import Form from "./Form";
import Movie from "./Movie";

const Router = () => (
  <HashRouter>
    <Switch>
      <Route path="/" component={App} exact />
      <Route path="/contact" component={Contact} />
      <Route path="/movie" component={Movie} />
    </Switch>
  </HashRouter>
);

export default Router;