我正在尝试将我的 angular 6 应用程序转换为服务器端渲染（用于 SEO 目的），并且一切似乎都编译无误。除了当我实际导航到本地主机时，我得到了完整的错误
Error: No NgModule metadata found for '[object Object]'.
at NgModuleResolver.resolve (/execroot/angular/packages/compiler/src/ng_module_resolver.ts:31:15)
at CompileMetadataResolver.getNgModuleMetadata (/execroot/angular/packages/compiler/src/metadata_resolver.ts:509:41)
at JitCompiler._loadModules (/execroot/angular/packages/compiler/src/jit/compiler.ts:127:49)
at JitCompiler._compileModuleAndComponents (/execroot/angular/packages/compiler/src/jit/compiler.ts:107:32)
at JitCompiler.compileModuleAsync (/execroot/angular/packages/compiler/src/jit/compiler.ts:61:33)
at CompilerImpl.compileModuleAsync (/execroot/angular/packages/platform-browser-dynamic/src/compiler_factory.ts:57:27)
at /execroot/nguniversal/modules/express-engine/src/main.ts:130:16
at new ZoneAwarePromise (/Users/melliotfrost/projects/myapp/node_modules/zone.js/dist/zone-node.js:891:29)
at getFactory (/execroot/nguniversal/modules/express-engine/src/main.ts:115:10)
at View.engine (/execroot/nguniversal/modules/express-engine/src/main.ts:92:7)
我正在运行命令 npm run build:ssr && npm run serve:ssr
app.module.ts（主模块）
Error: No NgModule metadata found for '[object Object]'.
at NgModuleResolver.resolve (/execroot/angular/packages/compiler/src/ng_module_resolver.ts:31:15)
at CompileMetadataResolver.getNgModuleMetadata (/execroot/angular/packages/compiler/src/metadata_resolver.ts:509:41)
at JitCompiler._loadModules (/execroot/angular/packages/compiler/src/jit/compiler.ts:127:49)
at JitCompiler._compileModuleAndComponents (/execroot/angular/packages/compiler/src/jit/compiler.ts:107:32)
at JitCompiler.compileModuleAsync (/execroot/angular/packages/compiler/src/jit/compiler.ts:61:33)
at CompilerImpl.compileModuleAsync (/execroot/angular/packages/platform-browser-dynamic/src/compiler_factory.ts:57:27)
at …