modCaptcha не работает

не пойму почему не работает modCaptcha,
в форме вызываю [[$modcaptcha]]

[[!AjaxForm?
    &snippet=`FormIt`
    &form=`AddaudioForm.tpl`
    &hooks=`checkcaptcha,formit2resource,FormItSaveForm`
    &emailSubject=``
    &emailTo=``
    &validate=`name:required,theme:required,
    speaker:required,date:required,place:required`
    &validationErrorMessage=`В форме содержатся ошибки!`
    &successMessage=`Сообщение успешно отправлено`
]]

сама форма

<form action="[[~[[*id]]]]" enctype="multipart/form-data" method="post" class="ajax_form af_example">

    <div class="form-group">
        <label class="control-label" for="af_name">Название</label>
        <div class="controls">
            <input type="text" id="af_name" name="name" value="[[+fi.name]]" placeholder="" class="form-control"/>
            <span class="error_name">[[+fi.error.name]]</span>
        </div>
    </div>

    <div class="form-group">
        <label class="control-label" for="af_theme">Тема</label>
        <div class="controls">
            <input type="text" id="af_theme" name="theme" value="[[+fi.theme]]" placeholder="" class="form-control"/>
            <span class="error_theme">[[+fi.error.theme]]</span>
        </div>
    </div>


    <div class="form-group">
        <label class="control-label" for="af_speaker">Спикер</label>
        <div class="controls">
            <input type="text" id="af_speaker" name="speaker" value="[[+fi.speaker]]" placeholder="" class="form-control"/>
            <span class="error_speaker">[[+fi.error.speaker]]</span>
        </div>
    </div>
    

    <div class="form-group">
        <label class="control-label" for="af_date">Дата</label>
        <div class="controls">
            <input type="text" id="af_date" name="date" value="[[+fi.date]]" placeholder="" class="form-control"/>
            <span class="error_date">[[+fi.error.date]]</span>
        </div>
    </div>
    
    <div class="form-group">
        <label class="control-label" for="af_place">Место</label>
        <div class="controls">
            <input type="text" id="af_place" name="place" value="[[+fi.place]]" placeholder="" class="form-control"/>
            <span class="error_place">[[+fi.error.place]]</span>
        </div>
    </div>

    <div class="form-group">
        [[$modcaptcha]]
        <div class="controls">
            <input type="text" id="af_php_captcha" name="php_captcha" value="[[+fi.php_captcha]]" placeholder="" class="form-control"/>
            <span class="error_php_captcha">[[+fi.error.php_captcha]]</span>
        </div>
    </div>
    
    <div class="form-group">
          <label for="upload">Прикрепить файл</label>
          <input type="file" name="upload">
          <p class="error_upload">[[+fi.error.upload]]</p>
    </div>

    <div class="form-group">
        <div class="controls">
            <button type="submit" class="btn btn-primary">Отправить</button>
        </div>
    </div>
    [[+fi.success:is=`1`:then=`
    <div class="alert alert-success">[[+fi.successMessage]]</div>
    `]]
    [[+fi.validation_error:is=`1`:then=`
    <div class="alert alert-danger">[[+fi.validation_error_message]]</div>
    `]]
</form>

Все отрабатывает нормально, кроме капчи...