echo '<p>'.sprintf(__('Unfortunately, <strong>%s</strong> can not run on PHP versions older than '.$this->minimum_version.'. Read more information about <a href="http://www.wpupdatephp.com/update/" target="_blank">how you can update</a>'), 'Auto Load Next Post').'.</p>';
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.