Getting error in product carousel managing magento site

Question

Uncaught Error: Call to a member function setBlockLimitId() on boolean

 

My code given below

 

<div id="productcarousel-block">

<?php echo $this->getLayout()->createBlock('productcarousel/product'.$activeTab)->setCustomproduct($filterBy)->setBlockLimitId("1c")->setTemplate('catalog/product/productcarousel/list.phtml')->toHtml(); ?>

</div>