eject报错 react运行npm run，如何解决？

npm run eject 报错 ，不知道为什么。npm i 也 弄过了 package.json 文件也配置过了
{
"devDependencies": {
"postcss-px-to-viewport": "^1.1.1"
},
"scripts": {
"start": "node scripts/start.js",
"build": "node scripts/build.js",
"test": "node scripts/test.js",
"eject": "react-scripts eject"
}
}