Alert is not function

@sagarkodte wrote:

Getting below error on sending otp

ERROR TypeError: alert is not a function
    at SafeSubscriber._error (home.ts:45)
    at SafeSubscriber.__tryOrUnsub (Subscriber.js:238)
    at SafeSubscriber.error (Subscriber.js:197)
    at Subscriber._error (Subscriber.js:128)
    at Subscriber.error (Subscriber.js:102)
    at MapSubscriber._next (map.js:82)
    at MapSubscriber.Subscriber.next (Subscriber.js:89)
    at XMLHttpRequest.onLoad (http.js:1556)
    at t.invokeTask (polyfills.js:3)
    at Object.onInvokeTask (core.js:4620)

I’m receiving the otp but page is not redirecting to the otp receive page because of this error

below is my code

import { Component } from '@angular/core';
import { NavController,Platform,AlertController } from 'ionic-angular';
import {Http, Headers } from '@angular/http';
import 'rxjs/add/operator/map';
import { OtpReceivePage } from '../otp-receive/otp-receive';


@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  mobile='';
  constructor(public alertCtrl: AlertController,
    public http:Http,
  public navCtrl:NavController) {



      }

    sendOTP()
    {

      if(this.mobile.length!=12)
      {
        let alert = this.alertCtrl.create({
          title: 'Mobile Number Required!',
          subTitle: 'Please enter your 10 digit mobile number with 91 country code!',
          buttons: ['OK']
        });
        alert.present();

      }
      else
      {
        this.http.get('http://localhost:8080/nexmosms/send-sms.php')
        .map(res => res.json())
        .subscribe(res => {

        console.log(JSON.stringify(res));
        this.navCtrl.push(OtpReceivePage,{mobileno:this.mobile})
        }, (err) => {
        alert("failed");
        });
      }
    }

}

Please help

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