Please make sure you have woocommerce Version: 3.1.1 installed as that is the latest supported version of the theme.
You can also try adding this in your
wp-config.php file located at the root directory of your site.
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You may add it before this line of code
/* That's all, stop editing! Happy blogging. */
Hope that helps