View file Hostbox/Hostbox-by-Brandio/WHMCS/hostbox-colourful/error/unknown-routepath.tpl

<div class="alert alert-danger">
    <strong><i class="fa fa-times-circle"></i> Sorry, but the previous page (<a href="{$referrer|escape}">{$referrer|escape}</a>) provided an invalid page link.</strong>
</div>