displays 'invalid credentials' when inputting unauthorized credentials

src/app/authentication/authentication.component.html

@@ -25,7 +25,7 @@ <h4 class="text-center mb-3">Log In</h4>
 						service of quality energy systems. Our commercial businesses include Kinsley Power Systems, a top distributor
 						of industrial and residential KOHLER® generators for over 50 years and Kinsley Energy Systems, representing
 						prime movers for co-generation, biomass and landfill applications.
-					</p>
+					</p>				 
 			</div>
 		</div>
 	</div>

src/app/authentication/authentication.component.ts

@@ -16,6 +16,7 @@ export class AuthenticationComponent implements OnInit {
   // private items: Array<string>;
   @ViewChild('email_input') email_input: ElementRef;
   @ViewChild('password_input') password_input: ElementRef;
+  content = null;
 
   constructor(private data: LoginService, private router: Router, private handleError: ErrorHandler) {
   }

src/app/http-error.interceptor.ts

@@ -8,6 +8,9 @@ import {
 } from '@angular/common/http';
 import { Observable, throwError } from 'rxjs';
 import { retry, catchError } from 'rxjs/operators';
+import { Component, Input} from '@angular/core';
+
+
 
 export class HttpErrorInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
@@ -19,7 +22,15 @@ export class HttpErrorInterceptor implements HttpInterceptor {
          if (error.error instanceof ErrorEvent) {
            // client-side error
            errorMessage = `Error: ${error.error.message}`;
-         } else {
+         }
+         else if (error.message == "Http failure response for http://sd5-backend.engr.uconn.edu/auth: 404 Not Found")
+         {
+          //console.log(error.message);
+
+          window.alert("Invalid Credentials");
+
+         } 
+         else {
            // server-side error
            //console.log("poop");
            errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;