Нужно исправить ИД формы Код (PHP): $this->extensionInfo = [ 'com_contact', '<form[^>]+id="contact-form".+</form>', '<label id="jform_contact.+>', '<button class="btn btn-primary validate" type="submit">', 'contact.submit', ]; на Код (PHP): $this->extensionInfo = [ 'com_contact', '<form[^>]+id="emailForm".+</form>', '<label id="jform_contact.+>', '<button class="btn btn-primary validate" type="submit">', 'contact.submit', ];