Angular Lazy Loaded Modules错误 - 'RouterModule.forRoot() called twice'

我正在我的angular 6应用程序中实现延迟加载的功能模块，并已成功配置一个“发票”功能，但我在为延迟加载的“费用”和“联系人”功能模块实施路由时遇到问题，它们的设置方式与第一种方式相同 .

每个模块都已导入AppModule，它们也使用SharedModule，我已将其导入AppModule和每个功能模块 .

使用“费用”或“联系人”模块路由到任何页面时，我在控制台中收到以下错误：

错误错误：未捕获（在承诺中）：错误：RouterModule.forRoot（）调用两次 . 延迟加载的模块应该使用RouterModule.forChild（） . 错误：RouterModule.forRoot（）调用两次 . 延迟加载的模块应该使用RouterModule.forChild（） . at provideForRootGuard（vendor.js：106249）

我_0984991_使用.forChild（路由）作为功能模块，但我唯一能想到的可能是导致这种情况在这个过程中的某个地方纠缠不清 . 基于之前有关其他人遇到此问题的问题，我检查了AppModule是否已导入任何其他模块，因此导致forRoot（）被调用两次，但事实并非如此 .

由于错误说明它与provideForRootGuard有关，我认为这可能与将CanActivateRootGuard导入每个模块有关，但删除它也不能解决问题 .

AppRoutingModule：

import { NgModule } from '@angular/core';
import { RouterModule, Routes, RouterLinkActive } from '@angular/router';
import { CanActivateRouteGuard } from './can-activate-route.guard';

// COMPONENTS
  // Dashboard
  import { DashboardComponent } from './dashboard/dashboard.component';
  // Login
  import { LoginComponent } from './login/login.component';
  // Register
  import { RegisterComponent } from './register/register.component';
  // Notifications
  import { NotificationsComponent } from './notifications/notifications.component';
  // Bank
  import { BankComponent } from './bank/bank.component';
  // Documents
  import { DocumentsComponent } from './documents/documents.component';

const routes: Routes = [
  {
    path: '',
    redirectTo: 'login',
    pathMatch: 'full'
  },
  {
    path: 'dashboard',
    component: DashboardComponent,
    canActivate: [CanActivateRouteGuard]
  },

  // Login/Register
  {
    path: 'login',
    component: LoginComponent
  },
  {
    path: 'register',
    component: RegisterComponent
  },

  // Notifications
  {
    path: 'notifications',
    component: NotificationsComponent,
    canActivate: [CanActivateRouteGuard]
  },
  {
    path: 'notifications/:id',
    component: NotificationsComponent,
    canActivate: [CanActivateRouteGuard]
  },

  // Bank
  {
    path: 'bank',
    component: BankComponent,
    canActivate: [CanActivateRouteGuard]
  },

  // Contacts
  {
    path: 'contacts',
    loadChildren: './contacts/contacts.module#ContactsModule'
  },

  // Expenses
  {
    path: 'expenses',
    loadChildren: './expenses/expenses.module#ExpensesModule'
  },

  // Invoices
  {
    path: 'invoices',
    loadChildren: './invoices/invoices.module#InvoicesModule'
  },

  // Documents
  {
    path: 'documents',
    component: DocumentsComponent,
    canActivate: [CanActivateRouteGuard]
  }
]

@NgModule ({

  imports: [
    RouterModule.forRoot(routes)
  ],

  exports: [
    RouterModule
  ]

})

AppModule

// ANGULAR CORE
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgModule } from '@angular/core';

// FEATURE MODULES
import { ContactsModule } from '@app/contacts/contacts.module';
import { ExpensesModule } from '@app/expenses/expenses.module';
import { InvoicesModule } from '@app/invoices/invoices.module';
import { BankModule } from '@app/bank/bank.module';
import { DocumentsModule } from '@app/documents/documents.module';

// MATERIAL MODULE
import { MaterialModule } from '@app/material.module';

// SHARED MODULE
import { SharedModule } from '@app/shared.module';

// COMPONENTS
import { AppComponent } from './app.component';
import { DashboardComponent } from './dashboard/dashboard.component'

// Account
import { LoginComponent } from './login/login.component'
import { RegisterComponent } from './register/register.component'
import { VerifyEmailDialogComponent } from './register/dialogs/verify-email-dialog/verify-email-dialog.component';

// Notifications
import { NotificationsComponent } from './notifications/notifications.component';

@NgModule({

  declarations: [
    AppComponent,

    // COMPONENTS
        // Dashboard
        DashboardComponent,
        // Login
        LoginComponent,
        // Register
        RegisterComponent,
            // Dialogs
            VerifyEmailDialogComponent,
        // Notifications
        NotificationsComponent
  ],

  imports: [
    // ANGULAR CORE
    BrowserModule,
    BrowserAnimationsModule,

    // FEATURE MODULES
    InvoicesModule,
    ContactsModule,
    ExpensesModule,
    BankModule,
    DocumentsModule,

    // MATERIAL MODULE
    MaterialModule,

    // SHARED MODULE
    SharedModule
  ],

  entryComponents: [
    // DIALOGS  
        // Register
        VerifyEmailDialogComponent
  ],

  providers: [

  ],

  bootstrap: [AppComponent]
})

export class AppModule { }

ExpensesRoutingModule

import { NgModule } from '@angular/core';
import { RouterModule, Routes, RouterLinkActive } from '@angular/router';
// import { CanActivateRouteGuard } from '@app/can-activate-route.guard';

// COMPONENTS
import { NewExpenseComponent } from './new-expense/new-expense.component';
import { ExpenseListComponent } from './expense-list/expense-list.component';
import { ViewExpenseComponent } from './view-expense/view-expense.component';

const routes: Routes = [
  {
    path: 'expenses/new',
    component: NewExpenseComponent,
    // canActivate: [CanActivateRouteGuard]
  },
  {
    path: 'expenses/all',
    component: ExpenseListComponent,
    // canActivate: [CanActivateRouteGuard]
  },
  {
    path: 'expenses/:id',
    component: ViewExpenseComponent,
    // canActivate: [CanActivateRouteGuard]
  },
]

@NgModule({

  imports: [
    RouterModule.forChild(routes)
  ],

  exports: [
    RouterModule
  ]

})

export class ExpensesRoutingModule {

}

ExpensesModule

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

import { ExpensesRoutingModule } from './expenses-routing.module';

// SHARED/MATERIAL MODULES
import { SharedModule } from '@app/shared.module';
import { MaterialModule } from '@app/material.module';

// COMPONENTS
    // New Expense
    import { NewExpenseComponent } from './new-expense/new-expense.component';
    // Expense List
    import { ExpenseListComponent } from './expense-list/expense-list.component';
    // View Expense
    import { ViewExpenseComponent } from './view-expense/view-expense.component';
    // Dialogs
    import { DeleteExpenseDialogComponent } from './view-expense/dialogs/delete-expense-dialog/delete-expense-dialog.component';

@NgModule({

  imports: [
    CommonModule,
    ExpensesRoutingModule,
    SharedModule,
    MaterialModule
  ],

  declarations: [
    // COMPONENTS
        // New Expense
        NewExpenseComponent,
        // Expense List
        ExpenseListComponent,
        // View Expense
        ViewExpenseComponent,
            // Dialogs
            DeleteExpenseDialogComponent
  ],

  entryComponents: [
    // DIALOGS
        // View Expense
        DeleteExpenseDialogComponent
  ]

})

export class ExpensesModule {

}

SharedModule Routing Imports

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

// ROUTING
import { AppRoutingModule } from './app-routing.module';
import { RouterLinkActive, CanActivate } from '@angular/router';
import { CanActivateRouteGuard } from './can-activate-route.guard';

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