Error in ngFor when used on button with ion-item 'attribute'

you can put in ion-list

<ion-list>
 <button ion-item
      *ngFor="let conversation of conversations"
      (click)="openConversation(conversation)">
      <ion-avatar item-left>
        <img width="40" height="40"
          src="{{ conversation.partner.profileUrl }}"
          alt="{{ conversation.partner.profileUrl }}">
      </ion-avatar>
      <h2> {{ conversation.partner.name }} </h2>
      <p> {{ conversation.getLastMessage().text }} </p>
    </button>
</ion-list>