Critical error updating to latest version x Fluid Checkout for WooCommerce

I updated the theme to its latest version on my Staging site a few days ago. When I did this, a critical error screen appeared on the site. I deactivated plugin by plugin to see if any of them were showing incompatibility. Unfortunately, on my production site, I had to deactivate a plugin that I use so that the latest version of the theme could be installed. Could you see what I can do to continue using the Fluid Checkout for WooCommerce plugin?

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