我遇到的错误是“无效的规则结果：Function（）;” 。我目前正在做的是尝试将Angular Universal添加到我的Angular 6项目中。产生此错误的代码是
ng add @nguniversal/express-engine --clientProject artists
现在，可以在本文https://angular.io/guide/universal中找到我要遵循的文档。发生的一切仅是运行以下代码行，并且我想生成文件。实际发生的是代码正在运行，然后在终端中显示一条消息，提示“通过npm安装工具包” ，然后出现“无效的规则结果：Function（）;” 。
我想补充一点，在开始遵循该文档之前，我已经完全遵循本文档https://github.com/angular/angular-cli/wiki/stories-universal-rendering，所以我已经有了其中一些文件，这些文件将由Angular Universal生成。 >
所以，我有两个问题。
1。错误无效的规则结果是什么：Function（）; 是什么意思，我该如何解决？
2。既然我已经有一些文件可以在运行上述代码后生成，那么这会干扰Angular Universal的安装吗？
这是我的package.json：
{
"name": "artists",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "^6.0.3",
"@angular/common": "^6.0.3",
"@angular/compiler": "^6.0.3",
"@angular/core": "^6.0.3",
"@angular/forms": "^6.0.3",
"@angular/http": "^6.0.3",
"@angular/platform-browser": "^6.0.3",
"@angular/platform-browser-dynamic": "^6.0.3",
"@angular/platform-server": "^7.2.12",
"@angular/router": "^6.0.3",
"@nguniversal/express-engine": "^7.1.1",
"@nguniversal/module-map-ngfactory-loader": "^7.1.1",
"@schematics/angular": "^7.3.8",
"core-js": "^2.5.4",
"express": "^4.16.4",
"jquery": "^3.3.1",
"rxjs": "6.0.0",
"zone.js": "^0.8.26"
},
"devDependencies": {
"@angular/compiler-cli": "^6.0.3",
"@angular-devkit/build-angular": "~0.6.8",
"typescript": "~2.7.2",
"@angular/cli": "~6.0.8",
"@angular/language-service": "^6.0.3",
"@types/jasmine": "~2.8.6",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~8.9.4",
"codelyzer": "~4.2.1",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~1.7.1",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.0",
"karma-jasmine": "~1.1.1",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.3.0",
"ts-node": "~5.0.1",
"tslint": "~5.9.1"
}
}