{if isset($error) && isset($error.subject) && !empty($error.subject)}
{assign var=class value=" field-error"}
{else}
{assign var=class value=""}
{/if}
{toolbar}
{if isset($error) && isset($error.content) && !empty($error.content)}
{assign var=class value=" field-error"}
{else}
{assign var=class value=""}
{/if}
{*here will go a plugin hook*}