Fatal Error | WordPress.org

Something went wrong during updating to the latest version of WordPress. When I tried logging in to wp-admin I got a message saying “There has been a critical error on this website” I clicked on the link to debugging in WordPress and set the wp-debug module in wp-config.php to true (i.e. on) and now I get the following message:-

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘WP_Block_Supports’ not found in /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-includes/class-wp-hook.php on line 287

Fatal error: Uncaught Error: Class ‘WP_Application_Passwords’ not found in /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-includes/user.php:316 Stack trace: #0 /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-includes/class-wp-hook.php(287): wp_authenticate_application_password(Object(WP_Error), ”, ”) #1 /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-includes/plugin.php(212): WP_Hook->apply_filters(Object(WP_Error), Array) #2 /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-includes/pluggable.php(549): apply_filters(‘authenticate’, NULL, ”, ”) #3 /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-includes/user.php(95): wp_authenticate(”, ”) #4 /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-login.php(1248): wp_signon(Array, false) #5 {main} thrown in /home/vol5_4/unaux.com/unaux_27249458/htdocs/wp-includes/user.php on line 316

Any ideas on how to fix this would be gratefully received.

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