Got the same problem: Error
Here is a little help.
1. Open: /wp-content/plugins/background-manager/app/Myatu/WordPress/BackgroundManager/Meta/Categories.php
2. Line: 47 = if (stristr($reg_taxonomy_key, ‘category’))
3. Change ‘category’ to ‘products’
= Hope it works for you. It worked in my WooCommerce 🙂
