thank you page critical error after redirecting back from payment gateway

since 4 days i am facing an issue with my website that when people successfully pay they dont get the thank you page because a critical error showing, i have spoken to the hosting team and they have advised me to contact your team, please find the attached, i kindly request your urgent support for this matter.

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Hello,

Could you please check how it works with some default WordPress themes like TwentyTwenty or WooCommerce Storefront to understand is it our theme issue or not?

Regards

cant do its live site

here is the full error log in private section

This error is caused by the custom PHP code in the child theme. Please, switch to the parent theme temporarily and test how it works.

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