将组件注册到app.module.ts

src/app/app.module.ts

@@ -6,10 +6,16 @@ import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
 
 import { AppRoutingModule } from './app-routing.module';
 import { AppComponent } from './app.component';
+import { TaskModalComponent } from './shared/task-modal/task-modal.component';
 
 @NgModule({
   declarations: [AppComponent],
-  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule],
+  imports: [
+    BrowserModule,
+    IonicModule.forRoot(),
+    AppRoutingModule,
+    TaskModalComponent
+  ],
   providers: [{ provide: RouteReuseStrategy, useClass: IonicRouteStrategy }],
   bootstrap: [AppComponent],
 })