NullInjectorError: No provider for ViewportScrolle

问题:

I'm building a simple angular application, using Angular Material to desing the front-end. The app just have 2 components rendered in the same page. When I serve the app, this is returned in the console:

NullInjectorError: "StaticInjectorError(AppModule)[RouterScroller -> ViewportScroller]: StaticInjectorError(Platform: core)[RouterScroller -> ViewportScroller]: NullInjectorError: No provider for ViewportScroller!"

AppModule.ts

          import { BrowserModule } from '@angular/platform-browser';
      import { NgModule } from '@angular/core';

      import { AppRoutingModule } from './app-routing.module';
      import { AppComponent } from './app.component';
      import { Material } from './Material';
      import { DataFormComponent } from './data-form/data-form.component';
      import { TemplateFormComponent } from './template-form/template-form.component';
      import { FormsModule } from '@angular/forms';


      @NgModule({
        declarations: [
          AppComponent,
          DataFormComponent,
          TemplateFormComponent,
        ],
        imports: [
          BrowserModule,
          AppRoutingModule,
          Material,
          FormsModule
        ],
        providers: [],
        bootstrap: [AppComponent]
      })
      export class AppModule { }

appComponents.ts

import { Component } from '@angular/core';

Material.ts(module for all angular material components)

                import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
            import {NgModule} from '@angular/core';
            import {MatTabsModule} from '@angular/material/tabs';
            import {MatInputModule} from '@angular/material';
            import {MatCardModule} from '@angular/material/card';
            import {MatToolbarModule} from '@angular/material/toolbar';
            import {MatFormFieldModule} from '@angular/material/form-field';
            import {MatButtonModule} from '@angular/material/button';

            @NgModule({
                imports:
                [
                    BrowserAnimationsModule,
                    MatTabsModule,
                    MatCardModule,
                    MatToolbarModule,
                    MatFormFieldModule,
                    MatInputModule,
                    MatButtonModule
                ],
                exports:
                [
                    BrowserAnimationsModule,
                    MatTabsModule,
                    MatCardModule,
                    MatToolbarModule,
                    MatFormFieldModule,
                    MatInputModule,
                    MatButtonModule
                ],
            })
            export class Material { }

            @Component({
              selector: 'app-root',
              templateUrl: './app.component.html',
              styleUrls: ['./app.component.css']
            })
            export class AppComponent {
              title = 'forms';
            }

AppRoutingModule.ts:

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { CursoModule } from './curso/curso.module';

const routes: Routes = [
 { 
  path: '', pathMatch: 'full', redirectTo: 'curso'
 },
 { 
  path: 'curso', loadChildren: './curso/curso.module#CursoModule'
  }
];

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

cursp-routing.module.ts:

import { CursosComponent } from './cursos.component';
import { RouterModule } from '@angular/router';
import { NgModule } from '@angular/core';
import { CursoListaComponent } from './curso-lista/curso-lista.component';

    const routes = [
    {
        path: '', component: CursoListaComponent
    }
    ]


 @NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
 })
 export class CursoRouting { }

回答1:

I had the same error - updating Angular in a project workes for me (it is a new project with only Angular Material, few simple components and simple routing).

ng update @angular/cli @angular/core

https://update.angular.io/#7.2:8.0

The error ocurred after I did:

npm install -S @angular/material @angular/cdk @angular/animations
npm uninstall @angular/core
npm install -S @angular/core

as a solution for error "export 'ɵɵinject' was not found in '@angular/core' (thrown after adding Angular Material to a brand new project).

It worked until I added routing and got NullInjectorError: No provider for ViewportScroller. But as mentioned in the beginning - updating the whole project to Angular v8 seems the solution.

回答2:

Make sure all of your packages are the same version. See this issue https://github.com/angular/angular/issues/31425

回答3:

if you think that you are set all config in each ngmodule files and it's not working. you have a issue with the version of angular core, angular material and angular cdk. so do this:

solved by deleting node_modules/ and package-lock.json / and yarn-lock (if exist) and running a fresh npm install