我的react应用程序在Heroku中运行时无法启动。我使用的是Luke McDonald的启动页面，位于：https://github.com/lukemcdonald/holly-react
下面是我的package.json脚本部分的外观：

"scripts": {
    "build": "npm run build:css && vite build",
    "build:css": "postcss styles/tailwind.css -o src/assets/styles.css",
    "dev": "concurrently \"npm run dev:css\" \"vite\"",
    "dev:css": "postcss styles/tailwind.css -o src/assets/styles.css --watch",
    "preview": "vite preview",
    "predeploy": "npm run build",
    "start": "concurrently \"npm run dev:css\" \"vite\"",
    "deploy": "gh-pages -d dist"
  },

当我推到heroku时，build 成功。但它启动失败：

app[web.1]: /tmp/start-497558d9.sh: 1: concurrently: not found
heroku[web.1]: Process exited with status 127
heroku[web.1]: State changed from starting to crashed

我同时添加了依赖项，但没有效果

"dependencies": {
    "clsx": "^1.1.1",
    "firebase": "^9.9.3",
    "gh-pages": "^4.0.0",
    "postcss-import": "^14.1.0",
    "react": "^18.1.0",
    "react-dom": "^18.1.0",
    "react-router-dom": "^6.3.0",
    "scrollreveal": "^4.0.9",
    "concurrently": "^7.3.0"
  },
  "devDependencies": {
    "@tailwindcss/forms": "^0.5.2",
    "@tailwindcss/typography": "^0.5.2",
    "@vitejs/plugin-react": "^1.3.2",
    "autoprefixer": "^10.4.7",
    "concurrently": "^7.3.0",
    "eslint": "^8.16.0",
    "eslint-config-prettier": "^8.5.0",
    "eslint-plugin-prettier": "^4.0.0",
    "eslint-plugin-react": "^7.30.0",
    "eslint-plugin-react-hooks": "^4.5.0",
    "postcss": "^8.4.14",
    "postcss-cli": "^9.1.0",
    "prettier": "^2.6.2",
    "prettier-plugin-tailwindcss": "^0.1.11",
    "tailwindcss": "^3.0.24",
    "vite": "^2.9.9"
  }