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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 22.1.1.2`
Operating system and version (eg, Ubuntu 20.04): Debian 10
Apache or nginx version (eg, Apache 2.4.25): nginx/1.14.2
PHP version (eg, 7.4): php7.3
The issue you are facing:
I cant access my webinterface because of an internal server error after i installed php-apcu.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Install PHP7.3-apcu
- Add ‘memcache.local’ => ‘\OC\Memcache\APCu’, to config.php
- Add apc.enable_cli=1 to /etc/php/7.3/fpm/php.ini
The output of your Nextcloud log in Admin > Logging:
Not available because i cant access the webinterface. This is the output of nextcloud/data/nextcloud.log
{"reqId":"FX0w368T9YF6akmXmlaa","level":3,"time":"2021-08-27T20:05:40+00:00","remoteAddr":"%IP%","user":"--","app":"base","method":"GET","url":"/status.php","message":"Failed to start session","userAgent":"Mozilla/5.0 (Windows) mirall/3.3.1stable-Win64 (build 20210812) (Nextcloud, windows-10.0.19043 ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"22.1.1.2","exception":{"Exception":"Exception","Message":"Failed to start session","Code":0,"Trace":[{"file":"/home/administrator/nextcloud/lib/base.php","line":423,"function":"__construct","class":"OC\\Session\\Internal","type":"->","args":["ocrx3jhkwm3u"]},{"file":"/home/administrator/nextcloud/lib/base.php","line":645,"function":"initSession","class":"OC","type":"::","args":[]},{"file":"/home/administrator/nextcloud/lib/base.php","line":1083,"function":"init","class":"OC","type":"::","args":[]},{"file":"/home/administrator/nextcloud/status.php","line":37,"args":["/home/administrator/nextcloud/lib/base.php"],"function":"require_once"}],"File":"/home/administrator/nextcloud/lib/private/Session/Internal.php","Line":62,"CustomMessage":"--"}}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'CENSORED',
'passwordsalt' => 'CENSORED',
'secret' => 'CENSORED',
'trusted_domains' =>
array (
0 => 'MYDOMAIN',
),
'datadirectory' => '/home/administrator/nextcloud/data',
'dbtype' => 'mysql',
'version' => '22.1.1.2',
'overwrite.cli.url' => 'MYDOMAIN',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nc_user',
'dbpassword' => 'MYPASS',
'installed' => true,
'app_install_overwrite' => true,
'skeletondirectory' => '/home/administrator/nextcloud/default-files',
array (
0 => 'twofactor_email',
1 => 'sharingpath',
2 => 'drop_account',
3 => 'groupfolders',
),
'updater.secret' => 'CENSORED',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'memcache.local' => '\OC\Memcache\APCu',
'memcache.distributed' => '\OC\Memcache\Redis',
'redis' => [
'host' => '127.0.0.1',
'port' => '6379',
],
);
The output of your Apache/nginx/system log in /var/log/____:
MYIP - user [27/Aug/2021:20:30:26 +0000] "GET /status.php HTTP/2.0" 200 1336 "-" "Mozilla/5.0 (Windows) mirall/3.3.1stable-Win64 (build 20210812) (Nextcloud, windows-10.0.19043 ClientArchitecture: x86_64 OsArchitecture: x86_64)"