Apriori und Calc funktionen hinzugefügt.

src/app/app.config.ts

@@ -2,11 +2,13 @@ import { ApplicationConfig, provideBrowserGlobalErrorListeners, provideZoneChang
 import { provideRouter } from '@angular/router';
 
 import { routes } from './app.routes';
+import {provideHttpClient} from '@angular/common/http';
 
 export const appConfig: ApplicationConfig = {
   providers: [
     provideBrowserGlobalErrorListeners(),
     provideZoneChangeDetection({ eventCoalescing: true }),
-    provideRouter(routes)
+    provideRouter(routes),
+    provideHttpClient()
   ]
 };