fix

src/app/modal/consult-billing/consult-billing.page.ts

@@ -0,0 +1,22 @@
+import { Component, OnInit } from '@angular/core';
+import { ModalController } from '@ionic/angular';
+
+@Component({
+  selector: 'app-consult-billing',
+  templateUrl: './consult-billing.page.html',
+  styleUrls: ['./consult-billing.page.scss'],
+})
+export class ConsultBillingPage implements OnInit {
+
+  constructor(private modalCtrl:ModalController) { }
+
+  ngOnInit() {
+  }
+  dismiss() {
+    // using the injected ModalController this page
+    // can "dismiss" itself and optionally pass back data
+    this.modalCtrl.dismiss({
+      'dismissed': true
+    });
+  }
+}