HI I am trying to create a masonary layout but getting the below error every time.

Fatal error: Call to a member function have_posts() on null in C:\wamp64\www\ilparmigiano1\wp-content\plugins\dhvc-woocommerce\includes\class.php on line 623

I also need your guidance on the below two issue.

Also I am trying to set the padding and margin for product title but this is not working.
the theme that I am using is Elegant themes -Divi

the website is ilparmigiano.com.au

Also please advise how I can control the add to cart button colour and hover colour.