Errors after WP update to 5.3

OK, after I manually installed WP Super Cache, the errors are still there.

My site URL is https://www.wasfuereintheater.com/

Can someone help me to fix it?

Hi,
I also get this error message since the last WordPress update 5.3 and can no longer log in:

Warning: include_once (/www/htdocs/w00d04f7/blog/wp-content/plugins/wp-super-cache/wp-cache-phase1.php): failed to open stream: No search file or directory in / www / htdocs / w00d04f7 / blog / wp-content / advanced-cache.php on line 8

Warning: include_once (): Failed opening ‘/www/htdocs/w00d04f7/blog/wp-content/plugins/wp-super-cache/wp-cache-phase1.php’ for inclusion (include_path = ‘.: / Usr / share / php: .. ‘) in /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php on line 8

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-login. php on line 496

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-login. php on line 512

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-includes / functions.php on line 5946

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-includes / pluggable.php on line 932

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-includes / pluggable.php on line 933

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-includes / pluggable.php on line 934

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-includes / pluggable.php on line 1265

Warning: Can not modify header information – headers already sent by (output started at /www/htdocs/w00d04f7/blog/wp-content/advanced-cache.php:8) in / www / htdocs / w00d04f7 / blog / wp-includes / pluggable.php on line 1268

How can I fix this?

It might help to visit the file system of your WP installation, and remove the wp-super-cache directory from /wp-contents/plugins/

In my case (I could still log in), I manually installed the plugin from the dashboard, then disabled caching in the settings.

Thanks for your help.
That was my first thought too.
But (although I had super-cache installed) there is no wp-super-cache folder in the plugin folder.
There is a separate cache folder with an empty supercache subfolder.

Basically, you deleted the plugin when you updated and did so incorrectly.

When you remove a caching plugin, you also need to remove the /wp-content/advanced-cache.php file along with it.

@krowb53 This is somebody else’s thread, please start your own topic for your own unrelated problems.

Thank you very much for the help.
Sometimes this solution to the problem is quite simple.
And sorry, for the incorrect placement of my question. I will pay attention to it in the future.
Have a nice day!

I had a similar error. You need to change the parameters to the walk function of your custom menu walker because the Walker class got updated in 5.3.

public function walk( $elements, $max_depth ) {

should be

public function walk( $elements, $max_depth, ...$args ) {