HTML Character Code Error


Hi guys,
I get my WordPress-based application error HTML Character Code. How can I fix this error?
I’m fetching articles with WP-JSON Api.

For example;


looks like an encoding error…
could you post the correct char at this position, please?


Single post codes here.

 <ion-view view-title="Teknoloji Tutkunlarının Ortak Adresi">
        <ion-content class="padding">
            <div class="item item-body">
                      <h1 class="post-title">{{postItem.title}}</h1>
    <img class="featured-image" ng-src="{{p.featured_image.attachment_meta.sizes.thumbnail.url}}">
                                <div ng-bind-html="postItem.content"></div>


no i ment the charactar between "Android M?yi.

so we can have a look what &#8217; stands for.