fix

src/app/app.module.ts

@@ -12,12 +12,13 @@ import { Camera } from '@ionic-native/camera/ngx';
 import { IonicStorageModule } from '@ionic/storage';
 
 import { HttpModule } from '@angular/http';
+import { HttpClientModule } from '@angular/common/http';
 
 
 @NgModule({
   declarations: [AppComponent],
   entryComponents: [],
-  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule,HttpModule,
+  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule,HttpModule,HttpClientModule,
     IonicStorageModule.forRoot()
   ],
   providers: [

src/app/tab1/tab1.page.ts

@@ -14,6 +14,8 @@ export class Tab1Page {
 constructor (public UserS :UserService){
 
 }
+
+
   goConnect(){
     this.UserS.connectUser();
   }