Getting problem in toastController

Ionic Framework ionic-v3
#1

Issues in Toast. i got below error

browser_adapter.js:84 Error: Uncaught (in promise): TypeError: activeNav.getActive is not a function
at resolvePromise (zone.js:538)
at zone.js:574
at ZoneDelegate.invokeTask (zone.js:356)
at Object.onInvokeTask (ng_zone_impl.js:44)
at ZoneDelegate.invokeTask (zone.js:355)
at Zone.runTask (zone.js:256)
at drainMicroTaskQueue (zone.js:474)
at XMLHttpRequest.ZoneTask.invoke (zone.js:426)

code that i used

presentToast() {
      let toast = this.toastCtrl.create({
        message: 'User was added successfully',
        duration: 3000,
        position: 'top'
      });
      toast.present();
    }