Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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, 12.0.2): 18.0.0
Operating system and version (eg, Ubuntu 17.04): unknown
Apache or nginx version (eg, Apache 2.4.25): unknown
PHP version (eg, 7.1): 7.4
The issue you are facing:
After successful update, getting HTTP 500 error when trying to log in.
As this is offsite webhosting provider, I don’t have access to command line
Is this the first time you’ve seen this error? (Y/N):
Steps to replicate it:
- Update from NC17
- Set php_value memory_limit 256M in htaccess to get past Step 5
- Finish update, turn off maintenance and go to admin
- HTTP 500
The output of your Nextcloud log in Admin > Logging:
03T12:30:05+00:00","remoteAddr":"69.41.57.53","user":"--","app":"PHP","method":"GET","url":"/ncloud/","message":"Declaration of OCA\\FilesAccessControl\\Operation::validateOperation($name, array $checks, $operation) must be compatible with OCP\\WorkflowEngine\\IOperation::validateOperation(string $name, array $checks, string $operation): void at /ncloud/apps/files_accesscontrol/lib/Operation.php#31","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3850.0 Iron Safari/537.36","version":"17.0.0.9"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '',
'passwordsalt' => '',
'secret' => '',
'trusted_domains' =>
array (
0 => '',
),
'datadirectory' => '/ncloud/data',
'dbtype' => 'mysql',
'version' => '17.0.0.9',
'overwrite.cli.url' => '',
'dbname' => '31001180_ncloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => '31001180_ncloud',
'dbpassword' => '',
'installed' => true,
'app_install_overwrite' =>
array (
0 => 'end_to_end_encryption',
),
'maintenance' => false,
'updater.secret' => '',
'updater.release.channel' => 'beta',
'theme' => '',
);
The output of your Apache/nginx/system log in /var/log/____:
unavailable
ahead of prosting)