How, I could add class error in Calc Guard in Uniform Plugin

How, I could add class error in Calc Guard in Uniform Plugin like

<input<?php if ($form->error('email')): ?> class="error"<?php endif; ?> id="field-email" name="email" type="email" value="<?php echo $form->old('email') ?>">

See the Uniform documentation: http://kirby-uniform.readthedocs.io/en/v2.3.0/guards/#calc

Thank you a lot…

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