Hello, sorry to hear about that,

this issue because today woocomerce update version 4.4.0, as you see in the following link cause lots of issues with lots of theme and plugins :

https://wordpress.org/support/topic/fatal-error-after-4-4-0-update/

but our developer checks it and fixed it, Pinkmart version 2.7.7 available to download that fully compatible with Woocomerce version 4.4.0.

Please update your Pinkmart theme and we hope this issue has been fixed on your website.

Please notice that We try to check the compatibility of the Pinkmart with the WooCommerce plugin as soon as possible.
Before updating WooCommerce, you should check the pinkmart change log to make sure Pinkmart compatibility is ready or not.

We are here if you need more help