Errors in displaying values in ion-list from array

Hi I have a problem in displaying in ion-list from the array. I used chrome inspect and it was not successful. Anyone can help?

Thank you!

Below are my codes:

home.html

<ion-header>
  <ion-navbar>
    <ion-title>
      Chat
    </ion-title>
  </ion-navbar>
</ion-header>


<!--<ion-content>
    <ion-list>
      <ion-item *ngFor="let question of questionList">
      {{question}}
      </ion-item>
    </ion-list>
</ion-content> -->

  <ion-content>
    <ion-list>
      <ion-item *ngFor="let answer of answersList">
      {{answer}}
      </ion-item>
    </ion-list>
</ion-content>

<ion-footer>  
  <ion-toolbar position="bottom">
    <ion-row style="align-items: stretch">
      <ion-col width-90>
        <input ion-textarea type="text" id = "inputText" [(ngModel)]="question" placeholder="Type a message..">
      </ion-col> 

      <ion-col>
        <button ion-button round (click)="ask()">Send</button>
      </ion-col>
    </ion-row>
  </ion-toolbar>
  
  <!--<div *ngFor="let answer of answers">
    {{answer}}
  </div>
  -->
</ion-footer>

home.ts

import { Component, NgZone } from '@angular/core';
import { NavController } from 'ionic-angular';
import { NavParams, AlertController } from 'ionic-angular';
import { Platform } from 'ionic-angular';
import { Parse } from 'parse';

// declare var ApiAIPromises: any;

declare var ApiAIPlugin: any;
@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  answersList: any = [];
  questionList = [];
  question;
  data: String;
  response;

  constructor(public platform: Platform, public ngZone: NgZone, public navCtrl: NavController, public navParams: NavParams, public alertCtrl: AlertController) {
    platform.ready().then(() => {
      ApiAIPlugin.init(
        {
          clientAccessToken: "TOKEN", // insert your client access key here
          lang: "en" // set lang tag from list of supported languages
        },
        result => { console.log('API AI ONLINE: ', result)},
        error => { console.log('API AI OFFLINE: ', error)}
      );

      
      // ApiAIPromises.init({ //error
      //   clientAccessToken: "TOKEN"
        
      // })
      // .then((result) =>  console.log("Hi I'm Mabel: " + result)) 

    });

    
  }

  ask() {

    console.log("User input question: "  + this.question);
    
    // ApiAIPlugin.requestText({
    //   query: this.question
    // })
    // .then(({result: {fulfillment: {speech}}}) => {
    //    this.ngZone.run(()=> {
    //      this.answer.push.apply(speech);
    //      console.log("Hey I manage to print second message");
    //    });
    // })

    try {
      ApiAIPlugin.requestText(
          {
              query: this.question
          },
          function (response) {
              // place your result processing here
              response = response.result.fulfillment.speech;
              console.log("Response: "+ JSON.stringify(response));
              

              //this.answersList.save(response);
              //alert(JSON.stringify(response));
              //this.userEnter();
          },
          function (error) {
              // place your error processing here 
              console.log("Error: "+ JSON.stringify(error));
              alert(error);
          });

  } catch (e) {
    console.log("Error: "+ JSON.stringify(e));
      alert(e);
    }
    
    this.answersList.push(this.response);
    console.log("Stored");

  } 

  load() {
    
    let self = this;
    var promises = [];

      //function success (answersList) {
          for (var a = 0; a > this.answersList ; a++) {
            var promise = new Parse.Promise();
            var responseFrm = this.answersList[a];
            var answer = responseFrm.getAnswer();
            self.answersList.push(answer);
            //this.answersList.push(response);
            promise.resolve(responseFrm);
            promises.push(promise);
            console.log("Sent");
          }

          Parse.Promise.when(promises).then(
            function (answersList) {
              console.log("Getting: " + JSON.stringify(answersList));
            }
          ) 
      //}
    }

  public getAnswer() {
      return this.data;
  }

  public setAnswer(data: String) {
    this.data = data;
  }

}