Unhandled Error!

        </div>
    </div>
 
	<div class="news-wrapper border-bottom">
		<div class="container">
            <ul class="col-xs-24 col-md-20 center-block pull-xs-none news-list">
                <? $post_list = $posts->find_all() ?>
                <? foreach ($post_list as $post): ?>
                    <li>
                        <div class="author pull-left hidden-xs">
                            <? $user_image = Users_User::create()->find($post->created_user_id); ?>
                            <div class="author-picture"style="background-image: url('<?php echo $user_image->photo->getThumbnailPath(150, 'auto')?>')"></div>