Missing argument 3 for avia… after WooCommerce update to 3.01

Hello,
I updated to WooCommerce 3.01 today and now the gallery images on my products don’t display properly and they show this error:
Missing argument 3 for avia_woocommerce_gallery_thumbnail_description() in /home/ncbr1/public_html/wp-content/themes/enfold/config-woocommerce/config.php on line 1360

Link: http://ncbr.org/product/ncbr-california-hoodie/
Code starting with line 1360:
function avia_woocommerce_gallery_thumbnail_description($img, $attachment_id, $post_id, $image_class )
{
$image_link = wp_get_attachment_url( $attachment_id );
if(!$image_link) return $img;
$image = wp_get_attachment_image( $attachment_id, apply_filters( ‘single_product_small_thumbnail_size’, ‘shop_thumbnail’ ) );
$image_title = esc_attr(get_post_field(‘post_content’, $attachment_id));
$img = sprintf( ‘%s‘, $image_link, $image_class, $image_title, $image );
return $img;
}

I tried removing the gallery images and re-adding them but the error still appears. I also went to WooCommerce’s support forum and they seem to think it’s an update needed in the theme. Please help.
Thanks!
Nikki