升级到Angular 6后,应用程序显示空白屏幕

我遵循了 https://update.angular.io/给出的步骤
升级到Angular 6后,应用程序显示所有路径的空白屏幕.并且浏览器控制台中也没有显示错误.每个路由重定向到默认路径 http://localhost:4200.
但 http://localhost:4200/admin工作正常.

任何人都可以帮忙,可能是什么问题？
您需要我提供哪些信息才能重现问题？

以下是依赖项列表：

"dependencies": {
    "@angular/animations": "6.0.3","@angular/cdk": "^6.2.0","@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/material": "^6.2.0","@angular/material-moment-adapter": "^6.2.0","@angular/platform-browser": "6.0.3","@angular/platform-browser-dynamic": "6.0.3","@angular/router": "6.0.3","@ng-bootstrap/ng-bootstrap": "^2.0.0","@ngx-translate/core": "^10.0.2","@ngx-translate/http-loader": "^3.0.1","@swimlane/ngx-charts": "^8.0.2","@types/lodash": "^4.14.87","bootstrap": "4.0.0","chart.js": "^2.7.2","classlist.js": "^1.1.20150312","codelyzer": "^4.3.0","core-js": "^2.5.1","font-awesome": "^4.7.0","lodash": "^4.17.4","moment": "^2.19.3","ng2-charts": "^1.6.0","ng2-dragula": "^1.3.1","ng2-file-upload": "^1.3.0","ng4-charts": "^1.0.2","rxjs": "^6.2.0","web-animations-js": "^2.2.5","zone.js": "^0.8.19"
  },"devDependencies": {
    "@angular-devkit/build-angular": "~0.6.6","@angular/cli": "^6.0.7","@angular/compiler-cli": "6.0.3","@types/jasmine": "2.5.38","@types/node": "^6.0.92","jasmine-core": "~2.5.2","jasmine-spec-reporter": "~3.2.0","karma": "~1.4.1","karma-chrome-launcher": "~2.0.0","karma-cli": "~1.0.1","karma-coverage-istanbul-reporter": "^0.2.0","karma-jasmine": "^1.1.1","karma-jasmine-html-reporter": "^0.2.2","node-sass": "^4.7.2","protractor": "~5.1.0","ts-node": "~2.0.0","tslint": "~5.10.0","typescript": "^2.7.2"
  }

angular.json

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json","version": 1,"newProjectRoot": "projects","projects": {
    "bcare": {
      "root": "","sourceRoot": "src","projectType": "application","architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser","options": {
            "outputPath": "dist","index": "src/index.html","main": "src/main.ts","tsConfig": "src/tsconfig.app.json","polyfills": "src/polyfills.ts","assets": [
              "src/assets"
            ],"styles": [
              "src/fonts.scss","src/styles.scss"
            ],"scripts": []
          },"configurations": {
            "prod": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts","with": "src/environments/environment.prod.ts"
                }
              ]
            }
          }
        },"serve": {
          "builder": "@angular-devkit/build-angular:dev-server","options": {
            "browserTarget": "bcare:build"
          },"configurations": {
            "prod": {
              "browserTarget": "bcare:build:prod"
            }
          }
        },"extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n","options": {
            "browserTarget": "bcare:build"
          }
        },"test": {
          "builder": "@angular-devkit/build-angular:karma","options": {
            "main": "src/test.ts","karmaConfig": "./karma.conf.js","tsConfig": "src/tsconfig.spec.json","scripts": [],"assets": [
              "src/assets"
            ]
          }
        },"lint": {
          "builder": "@angular-devkit/build-angular:tslint","options": {
            "tsConfig": [
              "src/tsconfig.app.json","src/tsconfig.spec.json"
            ],"exclude": []
          }
        }
      }
    },"bcare-e2e": {
      "root": "","sourceRoot": "","architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor","options": {
            "protractorConfig": "./protractor.conf.js","devServerTarget": "bcare:serve"
          }
        },"options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],"exclude": []
          }
        }
      }
    }
  },"defaultProject": "bcare","schematics": {
    "@schematics/angular:component": {
      "prefix": "cc","styleext": "scss"
    },"@schematics/angular:directive": {
      "prefix": "cc"
    }
  }
}

APP-routing.module.ts

import {RouterModule,Routes} from '@angular/router';
import {NotFoundComponent} from './core/main/not-found.component';
import {HomeComponent} from './core/main/home/home.component';
import {LoginComponent} from './core/main/login/login.component';
import {NgModule} from '@angular/core';
import {HomeGuard} from './core/main/home/home.guard';
import {CanLoadAdmin} from './core/services/can-load-admin';
import {RulesPreviewComponent} from './branches/preparation-admin/main/rules/rules-preview/rules-preview.component';

export const APP_ROUTES: Routes = [
    {
        path: '',component: HomeComponent,canActivate: [HomeGuard],children: [
            {
                path: '',redirectTo: 'preparation',pathMatch: 'full'
            },{
                path: 'preparation',loadChildren: 'app/branches/preparation/preparation.module#PreparationModule'
            },{
                path: 'admin',loadChildren: 'app/admin/admin/admin.module#AdminModule',canLoad: [CanLoadAdmin]
            }
        ]
    },{path: 'login',component: LoginComponent},{path: 'email-preview/:id',component: RulesPreviewComponent},{path: '**',component: NotFoundComponent},];


@NgModule({
    imports: [RouterModule.forRoot(APP_ROUTES)],exports: [RouterModule]
})
export class AppRoutingModule {
}