Angular 错误类型错误：ctor不是构造函数

我当时安装了@ng toolkit/universal

npm运行构建：prod

建立成功。 但是什么时候

npm运行服务器

我有一个和上面一样的问题。 谁能告诉我该怎么办？

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我使用Angular 8。

尝试通过修改server.js以添加日志来找出是哪个类导致了问题。尝试通过修改server.js以添加日志来找出是哪个类导致了问题

ERROR TypeError: ctor is not a constructor
at createClass (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:138903:24)
at createDirectiveInstance (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:138780:24)
at createViewNodes (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:147112:40)
at Object.createEmbeddedView (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:147020:9)
at TemplateRef_.createEmbeddedView (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:138495:42)
at ViewContainerRef_.createEmbeddedView (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:138361:39)
at NgIf._updateView (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:323486:49)
at NgIf.set [as ngIf] (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:323448:22)
at updateProp (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:139056:41)
at checkAndUpdateDirectiveInline (/opt/lampp/htdocs/2.3.0/gwp-web/dist/server.js:138807:23)