Issue:
Fatal error: Call to undefined method Mage_Catalog_Model_Resource_Category_Flat_Collection::groupByAttribute() in app/code/local/Sm/BasicProducts/Block/List.php

(The same: sm tablisting, sm slider, sm slideshow)

Solution:

Open app/code/local/Sm/BasicProducts/Block/List.php file, find this fundtion:

private function _addCategoryFilter(& $collection, $category_ids){
	$category_collection = Mage::getModel('catalog/category')->getCollection();
	$category_collection->addAttributeToSelect('*');
	$category_collection->addIsActiveFilter();
	if (count($category_ids)>0){
		$category_collection->addIdFilter($category_ids);
	}
	$category_collection->groupByAttribute('entity_id');
	$category_products = array();
	foreach ($category_collection as $category){
		$cid = $category->getId();
		if (!array_key_exists( $cid, $category_products)){
			$category_products[$cid] = $category->getProductCollection()->getAllIds();
			//Mage::log("ID: " . $cid );
			//Mage::log("collection->count(): " . count($category_products[$cid]) );
		}
	}
	$product_ids = array();
	if (count($category_products)){
		foreach ($category_products as $cp) {
			$product_ids = array_merge($product_ids, $cp);
		}
	}
	//Mage::log("merged_count: " . count($product_ids));
	$collection->addIdFilter($product_ids);
}

and change to:

private function _addCategoryFilter(& $collection, $category_ids){
	$category_collection = Mage::getModel('catalog/category')->getCollection();
	$category_collection->addAttributeToSelect('*');
	$category_collection->addIsActiveFilter();

	$product_ids = array();

	if (count($category_ids)>0){
		$category_collection->addIdFilter($category_ids);
	}

	if (!Mage::helper('catalog/category_flat')->isEnabled()) { 
		$category_collection->groupByAttribute('entity_id');
	}

	$category_products = array();
	foreach ($category_collection as $category){
		$cid = $category->getId();
		if (!array_key_exists( $cid, $category_products)){
			$category_products[$cid] = $category->getProductCollection()->getAllIds();
		//Mage::log("ID: " . $cid );
		//Mage::log("collection->count(): " . count($category_products[$cid]) );
		}	
	}	
}

Thanks!