Theme stops working after using "YITH WooCommerce Color and Label Variations"

Hi,

When I enable the plugin “YITH WooCommerce Color and Label Variations” the product page is stuck and gives an error. When I use the default theme its working.

Could you please take a look?

Link: https://acrylicool.com/product/ear-saver-fluor-green-small/

Thanks!