Error when exporting

Hello. There is an error when I click the export button. I think it just started recently after updating to PHP 8. Please check the plugin and reply.
Here is the error message ;
..
<p>이 웹사이트에 치명적인 오류가 있습니다.</p><p>워드프레스 장애복구에 관해 더 알아보기.</p>
..
Error Translation:
<p>There is a fatal error on this website.</p>

Error Image
https://ibb.co/mtYxQpX

The page I need help with: [log in to see the link]