在phtml中显示购物车项目Contactform（Magento）

Hello i just signed in to ask this question. i try to fix that issue with the given answers in that forum, but somthing won´t work. I just want to include the items in the shopping cart to an text-field in an magento kontactform. i use form.phtml

i try to display the sidebar cart with:

  <label for="comment">Artikel</label>
            <div class="input-box">
                <textarea name="comment" id="comment" title="Artikel" class="required-entry input-text" cols="5" rows="3">

                <?php echo $this->getLayout()->createBlock('core/template')->setTemplate('checkout/cart/sidebar/default.phtml')->toHtml(); ?>
                </textarea>
            </div>
        </li>
        <li class="wide">
            <label for="comment" class="required"><em>*</em><?php echo Mage::helper('contacts')->__('Comment') ?></label>
            <div class="input-box">
                <textarea name="comment" id="comment" title="<?php echo Mage::helper('contacts')->__('Comment') ?>" class="required-entry input-text" cols="5" rows="3"></textarea>

but i get this error:

Fatal error: Call to a member function getProduct() on a non-object in /www/htdocs/xxxxx/magento/app/design/frontend/base/default/template/checkout/cart/sidebar/default.phtml on line 29

in line 29 is:

$isVisibleProduct = $_item->getProduct()->isVisibleInSiteVisibility();

so may someone can help me, and sorry for my cruel english :-)

Actually, You are using core/template block that's why you are getting error so please use checkout/cart_sidebar block. Please replace your code with below code.

Your Code

<?php echo $this->getLayout()->createBlock('core/template')->setTemplate('checkout/cart/sidebar/default.phtml')->toHtml(); ?>

Replace with

<?php echo $this->getLayout()->createBlock('checkout/cart_sidebar')->setTemplate('checkout/cart/minicart/items.phtml')->toHtml(); ?>

Thanks