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NG002 Error: Could not be resolved to an NgModule class

I have added a new component to my angular project and made sure it is imported in my app module however I get a NG002 error saying:
error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class.
Is it missing an #NgModule annotation?
export class NavigationBarDriverComponent {
My app module looks like this:
import { BrowserModule } from '#angular/platform-browser';
import { NgModule } from '#angular/core';
import { HttpClientModule } from '#angular/common/http';
import {GoogleMapsAPIWrapper} from '#agm/core';
import { AppComponent } from './app.component';
import { ButtonComponent } from './button/button.component';
import { AgmCoreModule } from '#agm/core';
import { AgmDirectionModule } from 'agm-direction';
import { GooglePlaceModule } from "ngx-google-places-autocomplete";
import { NavigationBarComponent } from './navigation-bar/navigation-bar.component';
import { NavigationBarDriverComponent} from './navigation-bar-driver/navigation-bar-driver.component';
import { LayoutModule } from '#angular/cdk/layout';
import { MatToolbarModule } from '#angular/material/toolbar';
import { MatButtonModule } from '#angular/material/button';
import { MatSidenavModule } from '#angular/material/sidenav';
import { MatIconModule } from '#angular/material/icon';
import { MatListModule } from '#angular/material/list';
import { NoopAnimationsModule } from '#angular/platform-browser/animations';
import { OwlDateTimeModule, OwlNativeDateTimeModule } from 'ng-pick-datetime';
import { BrowserAnimationsModule } from '#angular/platform-browser/animations';
import { MatDialogModule } from '#angular/material/dialog';
import { RouteDialogComponent } from './route-dialog/route-dialog.component';
import { AppRoutingModule, routingComponents } from './app-routing.module';
#NgModule({
declarations: [
AppComponent,
ButtonComponent,
NavigationBarComponent,
NavigationBarDriverComponent,
RouteDialogComponent,
routingComponents
],
imports: [
BrowserModule,
AgmCoreModule.forRoot({
apiKey: 'AIzaSyDnibzvTPaquvcrp9ZYZZ5EFgzncyK1jys'
}),
AgmDirectionModule,
GooglePlaceModule,
LayoutModule,
MatToolbarModule,
MatButtonModule,
MatSidenavModule,
MatIconModule,
MatListModule,
NoopAnimationsModule,
HttpClientModule,
OwlDateTimeModule,
OwlNativeDateTimeModule,
BrowserAnimationsModule,
MatDialogModule,
MatButtonModule,
AppRoutingModule,
NavigationBarDriverComponent
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
and my NavigationBarDriverComponent looks like this:
import { Component, NgModule } from '#angular/core';
import { BreakpointObserver, Breakpoints } from '#angular/cdk/layout';
import { Observable } from 'rxjs';
import { map, shareReplay } from 'rxjs/operators';
#Component({
selector: 'app-navigation-bar-driver',
templateUrl: './navigation-bar-driver.component.html',
styleUrls: ['./navigation-bar-driver.component.css']
})
export class NavigationBarDriverComponent {
drawer;
isHandset$: Observable<boolean> = this.breakpointObserver.observe(Breakpoints.Handset)
.pipe(
map(result => result.matches),
shareReplay()
);
constructor(private breakpointObserver: BreakpointObserver) {}
}
I tried to restart the angular server with both "ng serve" and also "ng serve --prod" as I saw it suggested in another thread.

Remove NavigationBarDriverComponent from your app module import.

NullInjectorError: StaticInjectorError(AppModule)[NGXLoggerHttpService -> HttpBackend]:

I keep getting the following error after upgrading my NgxLogger module:
main.ts:17 NullInjectorError: StaticInjectorError(AppModule)[NGXLoggerHttpService -> HttpBackend]:
StaticInjectorError(Platform: core)[NGXLoggerHttpService -> HttpBackend]:
NullInjectorError: No provider for HttpBackend!
main.ts
import { enableProdMode } from '#angular/core';
import { platformBrowserDynamic } from '#angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
import { RecaptchaComponent } from 'ng-recaptcha';
if (environment.production) {
enableProdMode();
}
platformBrowserDynamic().bootstrapModule(AppModule).then(ref => {
if (window['ngRef']) {
window['ngRef'].destroy();
}
window['ngRef'] = ref;
}).catch(err => console.error(err));
RecaptchaComponent.prototype.ngOnDestroy = function () {
if (this.subscription) {
this.subscription.unsubscribe();
}
};
core.module.ts
import { NgModule } from '#angular/core';
import { environment } from 'src/environments/environment';
import { AngularFireModule } from '#angular/fire';
import { AngularFirestoreModule } from '#angular/fire/firestore';
import { AngularFireAuthModule } from '#angular/fire/auth';
import { BrowserModule } from '#angular/platform-browser';
import { AngularFireDatabaseModule } from '#angular/fire/database';
import { StoreModule } from '#ngrx/store';
import { metaReducers, reducers } from './core.state';
import { EffectsModule } from '#ngrx/effects';
import { AuthEffects } from '../modules/auth/auth.effects';
import { CustomNGXLoggerService, LoggerModule, NGXLogger, NGXLoggerHttpService } from 'ngx-logger';
#NgModule({
imports: [
AngularFireModule.initializeApp(environment.firebaseConfig),
AngularFirestoreModule,
AngularFireDatabaseModule,
AngularFireAuthModule,
BrowserModule,
StoreModule.forRoot(reducers, {
metaReducers,
runtimeChecks: {
strictActionImmutability: true,
strictStateImmutability: true,
},
}),
EffectsModule.forRoot([
AuthEffects
]),
],
providers: [
NGXLogger,
NGXLoggerHttpService,
CustomNGXLoggerService
]
})
export class CoreModule {
}
app.module.ts
import { NgModule } from '#angular/core';
import { AppComponent } from './app.component';
import { AuthService } from './modules/auth/auth.service';
import { ReferralService } from './modules/referral/referral.service';
import { UserService } from './modules/shared/services/user.service';
import { UtilService } from './modules/shared/services/util.service';
import { CoreModule } from './core/core.module';
import { NavbarModule } from './modules/shared/components/navbar/navbar.module';
import { FooterModule } from './modules/shared/components/footer/footer.module';
import { NgxUiLoaderModule } from 'ngx-ui-loader';
import { RouterModule, Routes } from '#angular/router';
import { LoggerModule } from 'ngx-logger';
import { environment } from '../environments/environment';
const routes: Routes = [
{ path: '', loadChildren: './modules/main/main.module#MainModule' },
];
#NgModule({
declarations: [
AppComponent
],
imports: [
RouterModule.forRoot(routes),
NavbarModule,
FooterModule,
CoreModule,
LoggerModule.forRoot(environment.logging),
NgxUiLoaderModule
],
providers: [
AuthService,
UtilService,
UserService,
ReferralService
],
bootstrap: [AppComponent]
})
export class AppModule {
}

You have that error because your NGXLoggerHttpService is depend on HttpBackend class but HttpBackend class did not import to your providers section in your module.ts. Try to import HttpBackend to your provider.

As mentioned in this issue, importing HttpClientModule and adding it in the imports of the module solves the problem
import { HttpClientModule } from '#angular/common/http';
...
imports: [ ..., HttpClientModule, ...]

Angular 6 tree diagram

I want to implement a tree diagram - something like this angular2-tree-diagram. Precisely, my task is a question-answer hierarchy where the question and answer will be propagated depending on the question and answer of the current node.
However, this package was made for Angular 2. I am trying to integrate it with Angular 6 and could not able to succeed in this occasion.
Main module [app.module.ts] script:
import { BrowserModule } from '#angular/platform-browser';
import { NgModule } from '#angular/core';
import { HttpClientModule, HTTP_INTERCEPTORS } from '#angular/common/http';
import { AppComponent } from './app.component';
import { BrowserAnimationsModule } from '#angular/platform-browser/animations';
import { AppMaterialModule } from './app-material.module';
import {
FormsModule,
ReactiveFormsModule
} from '../../node_modules/#angular/forms';
import { HeaderComponent } from './navigation/header/header.component';
import { FlexLayoutModule } from '#angular/flex-layout';
import { FooterComponent } from './navigation/footer/footer.component';
import { MobileSidemenuComponent } from './navigation/sidemenu/mobile-sidemenu/mobile-sidemenu.component';
import { LoginComponent } from './login/login.component';
import { PhonebookComponent } from './phonebook/phonebook.component';
import { TestWelcomePageComponent } from './test-welcome-page/test-welcome-page.component';
import { AppRoutingModule } from './app-routing.module';
import { FlashMessagesModule } from 'angular2-flash-messages';
import { FlashMessagesService } from 'angular2-flash-messages';
import { NgFlashMessagesModule } from 'ng-flash-messages';
import { MatDialogModule } from '#angular/material';
import { HttpModule } from '#angular/http';
import { TasksComponent } from './tasks/tasks.component';
import { NewsComponent } from './news/news.component';
import { AuthTokenInterceptor, ErrorInterceptor } from './interceptor';
import { RecordTaskFormInterceptor } from './interceptor';
import { PerformanceDialogComponent } from './performance-dialog/performance-dialog.component';
import { ProblemOverviewComponent } from './problem-overview/problem-overview.component';
import { TaskOrProblemTrackingComponent } from './task-or-problem-tracking/task-or-problem-tracking.component';
import { RecordDeviationComponent } from './record-deviation/record-deviation.component';
import { CreateInformationComponent } from './create-information/create-information.component';
import { AdminDomainSettingComponent } from './admin-domain-setting/admin-domain-setting.component';
import { AccountSettingComponent } from './account-setting/account-setting.component';
import { DashboardComponent } from './dashboard/dashboard.component';
import { NewsDialogComponent } from './news/news-dialog/news-dialog.component';
import { HomeComponent } from './home/home.component';
import { ProblemSolvingComponent } from './problem-solving/problem-solving.component';
import { ProblemStepperComponent } from './problem-solving/problem-stepper/problem-stepper.component';
import { DeviationFormComponent } from './problem-solving/deviation-form/deviation-form.component';
import { SpecificationFormComponent } from './problem-solving/specification-form/specification-form.component';
import { DescriptionFormComponent } from './problem-solving/description-form/description-form.component';
import { DirectcauseFormComponent } from './problem-solving/directcause-form/directcause-form.component';
import { AnalysisFormComponent } from './problem-solving/analysis-form/analysis-form.component';
import { ImplementationFormComponent } from './problem-solving/implementation-form/implementation-form.component';
import { FishboneDiagramComponent } from './problem-solving/fishbone-diagram/fishbone-diagram.component';
import { RecordTaskFormComponent } from './record-deviation/record-task-form/record-task-form.component';
import { RecordProblemFormComponent } from './record-deviation/record-problem-form/record-problem-form.component';
import { TreeDiagram } from 'angular2-tree-diagram';
#NgModule({
declarations: [
AppComponent,
HeaderComponent,
MobileSidemenuComponent,
FooterComponent,
LoginComponent,
PhonebookComponent,
TestWelcomePageComponent,
TasksComponent,
NewsComponent,
RecordTaskFormComponent,
PerformanceDialogComponent,
ProblemOverviewComponent,
TaskOrProblemTrackingComponent,
RecordDeviationComponent,
CreateInformationComponent,
AdminDomainSettingComponent,
AccountSettingComponent,
RecordProblemFormComponent,
DashboardComponent,
HomeComponent,
NewsDialogComponent,
ProblemSolvingComponent,
ProblemStepperComponent,
DeviationFormComponent,
SpecificationFormComponent,
DescriptionFormComponent,
DirectcauseFormComponent,
AnalysisFormComponent,
ImplementationFormComponent,
FishboneDiagramComponent
],
imports: [
BrowserModule,
BrowserAnimationsModule,
AppMaterialModule,
FlexLayoutModule,
FormsModule,
ReactiveFormsModule,
AppRoutingModule,
HttpModule,
HttpClientModule,
FlashMessagesModule.forRoot(),
NgFlashMessagesModule.forRoot(),
TreeDiagram
],
providers: [
{ provide: HTTP_INTERCEPTORS, useClass: AuthTokenInterceptor, multi: true },
{ provide: HTTP_INTERCEPTORS, useClass: ErrorInterceptor, multi: true },
{ provide: HTTP_INTERCEPTORS, useClass: RecordTaskFormInterceptor, multi: true },
FlashMessagesService,
MatDialogModule
],
bootstrap: [AppComponent],
entryComponents: [LoginComponent, PhonebookComponent, NewsDialogComponent]
})
export class AppModule { }
Any kind of help will be appreciated. Thanks

Angular Firebase authentication always redirects to home page

In this Angular project which I am practicing through a tutorial,when I try to access pages that require authentication, I am redirected to login page and even the URL changes to http://localhost:4200/login?returnURL=%2Fcheck-out.
But after logging in ,it always redirects to home page irrespective of the links.
app.component.ts:
import { Component } from '#angular/core';
import { AuthService } from './auth.service';
import { Router } from '../../node_modules/#angular/router';
#Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
constructor(private auth:AuthService, router:Router){
auth.user$.subscribe(user=>{
if(user){
let returnUrl=localStorage.getItem('returnUrl');
router.navigateByUrl(returnUrl);
}
});
}
}
auth.service.ts:
import { Injectable } from '#angular/core';
import { AngularFireAuth } from '../../node_modules/angularfire2/auth';
import { Observable } from '../../node_modules/rxjs';
import * as firebase from 'firebase';
import { ActivatedRoute } from '../../node_modules/#angular/router';
#Injectable({
providedIn: 'root'
})
export class AuthService {
user$: Observable<firebase.User>;
constructor(private afAuth:AngularFireAuth,private route:ActivatedRoute) {
this.user$=afAuth.authState;
}
login(){
let returnUrl=this.route.snapshot.queryParamMap.get('returnUrl') ||'/';
localStorage.setItem('returnUrl',returnUrl);
this.afAuth.auth.signInWithRedirect(new firebase.auth.GoogleAuthProvider());
}
logout(){
this.afAuth.auth.signOut();
}
}
app.module.ts:
import { BrowserModule } from '#angular/platform-browser';
import { NgModule } from '#angular/core';
import {AngularFireModule} from 'angularfire2';
import {AngularFireDatabaseModule} from 'angularfire2/database';
import {AngularFireAuthModule, AngularFireAuth} from 'angularfire2/auth';
import { Observable} from 'rxjs';
import {RouterModule, RouterOutlet, Routes} from '#angular/router';
import { AppComponent } from './app.component';
import { environment } from '../environments/environment';
import { BsNavbarComponent } from './bs-navbar/bs-navbar.component';
import { HomeComponent } from './home/home.component';
import { ProductsComponent } from './products/products.component';
import { ShoppingCartComponent } from './shopping-cart/shopping-cart.component';
import { CheckOutComponent } from './check-out/check-out.component';
import { OrderSucessfulComponent } from './order-sucessful/order-sucessful.component';
import { MyOrdersComponent } from './my-orders/my-orders.component';
import { AdminProductsComponent } from './admin/admin-products/admin-products.component';
import { AdminOrdersComponent } from './admin/admin-orders/admin-orders.component';
import { LoginComponent } from './login/login.component';
import {NgbModule} from '#ng-bootstrap/ng-bootstrap';
import { AuthService } from './auth.service';
import { AuthGuard } from './auth-guard.service';
export const appRoutes: Routes = [
{path:'',component:HomeComponent},
{path:'products',component:ProductsComponent},
{path:'shopping-cart',component:ShoppingCartComponent},
{path:'login',component:LoginComponent},
{path:'check-out',component:CheckOutComponent,canActivate:[AuthGuard]},
{path:'order-sucessful',component:OrderSucessfulComponent,canActivate:[AuthGuard]},
{path:'my/orders',component:MyOrdersComponent,canActivate:[AuthGuard]},
{path:'admin/products',component:AdminProductsComponent,canActivate:[AuthGuard]},
{path:'admin/orders',component:AdminOrdersComponent,canActivate:[AuthGuard]}
]
#NgModule({
declarations: [
AppComponent,
BsNavbarComponent,
HomeComponent,
ProductsComponent,
ShoppingCartComponent,
CheckOutComponent,
OrderSucessfulComponent,
MyOrdersComponent,
AdminProductsComponent,
AdminOrdersComponent,
LoginComponent
],
imports: [
BrowserModule,
RouterModule.forRoot(appRoutes),
AngularFireModule.initializeApp(environment.firebase),
AngularFireDatabaseModule,
AngularFireDatabaseModule,
NgbModule.forRoot()
],
providers: [AngularFireAuth,AuthService,AuthGuard],
bootstrap: [AppComponent]
})
export class AppModule { }

Seems to be in your localStorage.getItem('returnUrl'); always set to root of the application better to first check if there is a value and then remove that value and redirect the user like below:
let returnUrl = localStorage.getItem('returnUrl');
if (returnUrl) {
localStorage.removeItem('returnUrl');
router.navigateByUrl(returnUrl);
}
Hope this will helps you!

Angular 4 and Angular Material long loading

Currently working on a portal https://scrawlless.com . I have an issue with long loading and not loading on some devices at all! Can you please check this web site? How can i reduce time of it's loading? It is powered by Angular 4, using Angular Material lib.
Why it can happen? It is not working at all on devices like Iphone 4, Lumia 520, 540 etc.
That is my app.module.ts file code:
import { BrowserModule } from '#angular/platform-browser';
import { NgModule } from '#angular/core';
import { FormsModule } from '#angular/forms';
import { HttpModule } from '#angular/http';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { AuthenticationService } from './_services/authentication.service';
import { SocketService } from './_services/socket.service';
import { AuthGuard } from './_guards/auth.guard';
import { BrowserAnimationsModule } from '#angular/platform-browser/animations';
import { MdNativeDateModule, MdDatepickerModule, MdButtonToggleModule, MdListModule, MdSnackBarModule, MdSelectModule, MdCheckboxModule, MdDialogModule, MdProgressSpinnerModule, MdInputModule, MdGridListModule, MdTooltipModule, MdSidenavModule, MdButtonModule, MdCardModule, MdMenuModule, MdToolbarModule, MdIconModule, MdTabsModule } from '#angular/material';
import { BodyComponent } from './_components/pages/body/body.component';
import { WorkspaceComponent } from './_components/pages/workspace/workspace.component';
import { IndexComponent } from './_components/pages/index/index.component';
import { UserDashboardComponent } from './_components/dashboards/user-dashboard/user-dashboard.component';
import { TeacherDashboardComponent } from './_components/dashboards/teacher-dashboard/teacher-dashboard.component';
import { UserSidebarComponent } from './_components/sidebars/user-sidebar/user-sidebar.component';
import { TeacherSidebarComponent } from './_components/sidebars/teacher-sidebar/teacher-sidebar.component';
import { SeparatorComponent } from './_components/other/separator/separator.component';
import { LearnMoreDialogComponent } from './_components/dialogs/learn-more-dialog/learn-more-dialog.component';
import { AdditionDialogComponent } from './_components/dialogs/addition-dialog/addition-dialog.component';
import { SearchUsersDialogComponent } from './_components/dialogs/search-users-dialog/search-users-dialog.component';
import { SearchDialogsDialogComponent } from './_components/dialogs/search-dialogs-dialog/search-dialogs-dialog.component';
import { ProfileViewDialogComponent } from './_components/dialogs/profile-view-dialog/profile-view-dialog.component';
import { NewListCreateComponent } from './_components/dialogs/new-list-create/new-list-create.component';
import { AdditionColumnComponent } from './_components/columns/addition-column/addition-column.component';
import { MultiplicationColumnComponent } from './_components/columns/multiplication-column/multiplication-column.component';
import { DivisionColumnComponent } from './_components/columns/division-column/division-column.component';
import { StudentInfoComponent } from './_components/info/student-info/student-info.component';
import { TeacherInfoComponent } from './_components/info/teacher-info/teacher-info.component';
import { UsersListComponent } from './_components/dashboards/users-list/users-list.component';
import { ChatComponent } from './_components/dashboards/chat/chat.component';
import { ConnectedDevicesComponent } from './_components/dashboards/connected-devices/connected-devices.component';
import { MarksTableComponent } from './_components/dashboards/marks-table/marks-table.component';
import { ListsComponent } from './_components/dashboards/lists/lists.component';
import { EditProfileComponent } from './_components/dashboards/edit-profile/edit-profile.component';
import { MessagesOverviewComponent } from './_components/other/messages-overview/messages-overview.component';
import { InfiniteScrollModule } from 'ngx-infinite-scroll';
import { MobileKeyboardComponent } from './_components/pages/mobile-keyboard/mobile-keyboard.component';
#NgModule({
declarations: [
AppComponent,
BodyComponent,
UserDashboardComponent,
TeacherDashboardComponent,
UserSidebarComponent,
TeacherSidebarComponent,
SeparatorComponent,
IndexComponent,
LearnMoreDialogComponent,
WorkspaceComponent,
AdditionColumnComponent,
MultiplicationColumnComponent,
DivisionColumnComponent,
AdditionDialogComponent,
StudentInfoComponent,
TeacherInfoComponent,
UsersListComponent,
ChatComponent,
ConnectedDevicesComponent,
MarksTableComponent,
ListsComponent,
SearchUsersDialogComponent,
SearchDialogsDialogComponent,
MessagesOverviewComponent,
ProfileViewDialogComponent,
EditProfileComponent,
NewListCreateComponent,
MobileKeyboardComponent,
],
entryComponents: [
LearnMoreDialogComponent,
AdditionDialogComponent,
SearchUsersDialogComponent,
SearchDialogsDialogComponent,
ProfileViewDialogComponent,
NewListCreateComponent
],
imports: [
AppRoutingModule,
BrowserModule,
FormsModule,
HttpModule,
BrowserAnimationsModule,
MdNativeDateModule,
MdDatepickerModule,
MdButtonToggleModule,
MdListModule,
MdSnackBarModule,
MdSelectModule,
MdCheckboxModule,
MdDialogModule,
MdProgressSpinnerModule,
MdInputModule,
MdGridListModule,
MdTooltipModule,
MdSidenavModule,
MdButtonModule,
MdMenuModule,
MdCardModule,
MdToolbarModule,
MdIconModule,
MdTabsModule
],
providers: [
AuthGuard,
AuthenticationService,
SocketService,
MdNativeDateModule
],
bootstrap: [AppComponent]
})
export class AppModule { }