Accessing the error logs can point you to the cause of the critical error. Try to ask your hosting provider for support to help you access the error logs. After gaining access, they should be able to help you understand the cause of the problem.
Additionally, you could enable debugging in WordPress. Add these lines of code to the wp-config.php file before the line /* That's all, stop editing! Happy blogging. */.
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );
Also, change the define( 'WP_DEBUG', false ); to define( 'WP_DEBUG', true );. This line should be above /* Add any custom values between this line and the "stop editing" line. */
This guide could help you gain clarity when debugging in WordPress: https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/.
Your hosting provider’s support could also help you make changes to the wp_config.php file. If you need help understanding the error, come back to this thread and post it in your next response. We will be able to advise further.
Hope this helps.
It sounds like a plugin or theme conflict could be triggering the critical error when accessing the network dashboard. I’d recommend temporarily disabling all plugins via FTP or phpMyAdmin (just rename the /plugins folder), then reactivate them one by one to pinpoint the cause.
