Angular Universal npm run serve：universal获取错误：ERROR ReferenceError：未定义$

Question

我从Angular 5中构建了一个Angular Universal项目，当我运行时

npm run serve:universal

我遇到错误： 以下文件中的“错误ReferenceError：$未定义”：

at new n (\dist-server\main.bundle.js:1:4483078)
at _createClass (\node_modules\@angular\core\bundles\core.umd.js:10969:20)
at _createProviderInstance$1 (\node_modules\@angular\core\bundles\core.umd.js:10945:26)
at resolveNgModuleDep (node_modules\@angular\core\bundles\core.umd.js:10930:17)
at NgModuleRef_.get (\node_modules\@angular\core\bundles\core.umd.js:12167:16)
at resolveDep (\node_modules\@angular\core\bundles\core.umd.js:12657:45)
at createClass (\node_modules\@angular\core\bundles\core.umd.js:12527:32)
at createDirectiveInstance (\node_modules\@angular\core\bundles\core.umd.js:12364:37)
at createViewNodes (\node_modules\@angular\core\bundles\core.umd.js:13822:53)

请给我一个解决方案。谢谢！