Unhandled Error!

<a class="addthis_button_preferred_4"></a>
<a class="addthis_button_compact"></a>
<a class="addthis_counter addthis_bubble_style"></a>
</div>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=xa-5015a4c20b532eb5"></script>
<!-- AddThis Button END -->  
<p>Start Date: <?= $event->start_date->format('%d/%m/%y') ?></p>
<? if($event->end_date != $event->start_date): ?><p>End Date: <?= $event->end_date->format('%d/%m/%y') ?></p><? endif ?>
<p>Event Type: <?= $event->eventtype ?></p>
<? if(!empty($event->price) && $event->price != '0'): ?><p>Price: <?= format_currency($event->price) ?></p><? endif ?>
<?= $event->description ?>
<p><a href="<?= root_url('/events') ?>">Back to events</a></p>