Ionic 4 Form Validation?

Same here…
@mytzui, yes i imported both FormsModule and ReactiveFormsModule (ionic 4.10.2)

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';

import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';
import { IonicStorageModule } from '@ionic/storage';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { ReactiveFormsModule, FormsModule} from '@angular/forms';

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
    BrowserModule, IonicModule.forRoot(), AppRoutingModule,
    IonicStorageModule.forRoot(),
    FormsModule,
    ReactiveFormsModule
  ],
  providers: [
    StatusBar,
    SplashScreen,
    AngularFireAuth,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}