Critical Error

– The exact reason for the errors should be visible in the error log, which you can find in your hosting area. If needed, your hosting provider’s support team can assist you with locating it.

– Alternatively, you can enable debugging in WordPress to gather more information. To do this, add a few specific lines to your wp-config.php file. For full guidance and step-by-step instructions on enabling the debug log, refer to the WordPress Developer Documentation: https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/.

– More sources:
https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-critical-error-in-wordpress/
https://kinsta.com/knowledgebase/there-has-been-a-critical-error-on-your-website/