Memcache not working | WordPress.org

Hi!

I noticed the following php message on the top of the admin dashboard
Notice: Trying to access array offset on value of type null in /home/webadmin/public_html/bitheory.hu/wp-content/plugins/w3-total-cache/Util_Installed.php on line 145

Also W3 Total Cache shows the following:

The following memcached servers are not responding or not running:
Object Cache: 127.0.0.1:11211.
This message will automatically disappear once the issue is resolved.

It’s a CentOS szerver with memcache, Redis, PHP 7.4 or PHP 8.0 (all of them installed, i can choose, this message shown up on every version)

It was working back then, so i don’t know what is wrong.