I have created a custom "404 - page not found" page to handle situations where the user enters a URL that does not match any paths in my web app:

export const routerConfig: Routes = [
   {
      component: LandingPageComponent,
      path: "",
   },
   {
      component: ProfilePageComponent,
      path: "profile",
   },
   {
      component: NotFoundPageComponent,
      path: "**",
   },
];

However, when I type in my app address followed by an incorrect path (e.g. http://localhost:3000/prcds), it simply shows:

Cannot GET /prcds

On a blank web page with an error message in the console:

Failed to load resource: the server responded with a status of 404 (Not Found)

I have already imported NotFoundPageModule into my app.module.

To resolve this issue, I referred to the "configuration" section on the Angular documentation website (https://angular.io/docs/ts/latest/guide/router.html) and adapted their approach for setting up the 404 notfound page in my project.

How can I prevent the display of the error message and instead show the custom 404 error page I designed?

The error page is similar to the one mentioned in another query, so there might be a connection to this issue:

My Code:

File structure of the not found page:

https://i.sstatic.net/PeKUv.png

notfoundpage.component.ts

import { Component } from "@angular/core";
import { Title } from "@angular/platform-browser";

@Component({
   selector: "not-found-page",
   styleUrls: ["dist/app/components/not-found-page/not-found-page.component.css"],
   templateUrl: "dist/app/components/not-found-page/not-found-page.component.html",
})
export class NotFoundPageComponent {
   constructor(private titleService: Title) {
      this.titleService.setTitle("Not Found");
   }
}

notfoundpage.module.ts

import { CommonModule } from "@angular/common";
import { NgModule } from "@angular/core";
import { FormsModule } from "@angular/forms";
import * as NotFoundPage from "./index";

@NgModule({
   declarations: [
      NotFoundPage.NotFoundPageComponent,
   ],
   exports: [NotFoundPage.NotFoundPageComponent],
   imports: [CommonModule, FormsModule],
})
export class NotFoundPageModule { }

app.module.ts

// tslint:disable-next-line:no-reference
/// <reference path="../../../node_modules/moment/moment.d.ts" />

// Angular 2 modules
import { Component, NgModule } from "@angular/core";
import {
   ControlValueAccessor,
   FormBuilder,
   FormGroup,
   FormsModule,
   ReactiveFormsModule,
   Validators,
} from "@angular/forms";
import { BrowserModule } from "@angular/platform-browser";
import { RouterModule } from "@angular/router";
import { AgmCoreModule } from "angular2-google-maps/core";
import { routerConfig } from "../app.routes";

// Plugin modules
import { Ng2Bs3ModalModule } from "ng2-bs3-modal/ng2-bs3-modal";

// App modules
import { AboutPageModule } from "../components/about-page/about-page.module";
import { AddPageModule } from "../components/add-page/add-page.module";
import { FindPageModule } from "../components/find-page/find-page.module";
import { LandingPageModule } from "../components/landing-page/landing-page.module";
import { NotFoundPageModule } from "../components/not-found-page/not-found-page.module";
import { ProfilePageModule } from "../components/profile-page/profile-page.module";
import { RegisterPageModule } from "../components/register-page/register-page.module";
import { SharedModule } from "../components/shared/shared.module";
import { AppComponent } from "./app.component";

@NgModule({
   bootstrap: [AppComponent],
   declarations: [
      AppComponent,
   ],
   imports: [
      BrowserModule,
      RouterModule.forRoot(routerConfig),
      FormsModule,
      Ng2Bs3ModalModule,
      AgmCoreModule,
      ReactiveFormsModule,
      LandingPageModule,
      FindPageModule,
      AddPageModule,
      AboutPageModule,
      RegisterPageModule,
      ProfilePageModule,
      NotFoundPageModule,
      SharedModule,
   ],
   providers: [
      FormBuilder,
   ],
})
export class AppModule { }

Complete app.routes.ts:

import { Routes } from "@angular/router";
import { AboutPageComponent } from "./components/about-page/about-page.component";
import { AddPageComponent } from "./components/add-page/add-page.component";
import { FindPageComponent } from "./components/find-page/find-page.component";
import { LandingPageComponent } from "./components/landing-page/landing-page.component";
import { NotFoundPageComponent } from "./components/not-found-page/not-found-page.component";
import { ProfilePageComponent } from "./components/profile-page/profile-page.component";
import { RegisterPageComponent } from "./components/register-page/register-page.component";

export const routerConfig: Routes = [
   {
      component: LandingPageComponent,
      path: "",
   },
   {
      path: "",
      pathMatch: "full",
      redirectTo: "",
   },
   {
      component: FindPageComponent,
      path: "find",
   },
   {
      component: AddPageComponent,
      path: "add",
   },
   {
      component: RegisterPageComponent,
      path: "register",
   },
   {
      component: AboutPageComponent,
      path: "about",
   },
   {
      component: ProfilePageComponent,
      path: "profile",
   },
   {
      path: "**",
      pathMatch: "full",
      redirectTo: "NotFoundPageComponent",
   },
   {
      component: ProfilePageComponent,
      path: "**",
   },
];