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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): 26.0 beta 1
Operating system and version (eg, Ubuntu 20.04): Debian 11 (Bullseye)
Apache or nginx version (eg, Apache 2.4.25): NginX 1.23.3
PHP version (eg, 7.4): 8.1
The issue you are facing:
After upgrading to NC26 beta1 I can’t access the WebUI anymore. Login screen is getting displayed, but after entering my credentials I get an HTTP error 500.
System is still sending notifications about new app versions via mail
Is this the first time you’ve seen this error? (Y/N): y
Steps to replicate it:
- upgrade from latest NC 25 to NC 26b1
- try to login
The output of your Nextcloud log in Admin > Logging:
(can't access that page)
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oczzuwbpg95u',
'passwordsalt' => 'redacted',
'secret' => 'redacted',
'trusted_domains' =>
array (
0 => 'example.com,
1 => 'cloud.example.com',
2 => '192.168.xxx.*',
3 => 'nextcloud.example.com',
),
'datadirectory' => '/mnt/STOR/nextcloud-data',
'dbtype' => 'mysql',
'version' => '26.0.0.3',
'overwrite.cli.url' => 'http://localhost',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:/var/run/mysqld/mysqld.sock',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'redacted',
'dbpassword' => 'GoTryYourOwn',
'installed' => true,
'activity_expire_days' => 14,
'auth.bruteforce.protection.enabled' => true,
'blacklisted_files' =>
array (
0 => '.htaccess',
1 => 'Thumbs.db',
2 => 'thumbs.db',
),
'cron_log' => true,
'enable_previews' => true,
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\BMP',
4 => 'OC\\Preview\\XBitmap',
5 => 'OC\\Preview\\Movie',
6 => 'OC\\Preview\\PDF',
7 => 'OC\\Preview\\MP3',
8 => 'OC\\Preview\\TXT',
9 => 'OC\\Preview\\MarkDown',
),
'filesystem_check_changes' => 1,
'filelocking.enabled' => 'true',
'htaccess.RewriteBase' => '/',
'integrity.check.disabled' => false,
'knowledgebaseenabled' => false,
'logfile' => '/mnt/STOR/web/nextcloud-data/nextcloud.log',
'loglevel' => 0,
'logtimezone' => 'Europe/Berlin',
'log_rotate_size' => 104857600,
'maintenance' => false,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.0,
),
'memcache.locking' => '\\OC\\Memcache\\Redis',
'overwriteprotocol' => 'https',
'preview_max_x' => 1024,
'preview_max_y' => 768,
'preview_max_scale_factor' => 1,
'quota_include_external_storage' => false,
'share_folder' => '/Shares',
'skeletondirectory' => '',
'theme' => '',
'trashbin_retention_obligation' => 'auto, 7',
'updater.release.channel' => 'beta',
'mail_smtpmode' => 'sendmail',
'mail_sendmailmode' => 'pipe',
'mail_from_address' => 'nextcloud',
'mail_domain' => 'schorers.org',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'example.com',
'mail_smtpport' => '587',
'mail_smtpname' => 'user@example.com',
'mail_smtppassword' => 'redacted',
'mail_smtpsecure' => 'tls',
'default_phone_region' => 'DE',
'app_install_overwrite' =>
array (
0 => 'dicomviewer',
1 => 'files_mindmap',
2 => 'carnet',
3 => 'onlyoffice',
4 => 'richdocuments',
5 => 'richdocumentscode',
6 => 'documentserver_community',
7 => 'files_photospheres',
8 => 'telephoneprovider',
9 => 'audioplayer',
10 => 'audioplayer_editor',
11 => 'extract',
12 => 'tasks',
13 => 'ocsms',
14 => 'files_trackdownloads',
15 => 'ocdownloader',
16 => 'twofactor_u2f',
17 => 'checksum',
18 => 'event_update_notification',
19 => 'mindmap_app',
20 => 'contacts',
21 => 'deck',
22 => 'spreed',
23 => 'twofactor_webauthn',
),
'has_rebuilt_cache' => true,
);
The output of your Apache/nginx/system log in /var/log/nginx/nextcloud-access.log:
80.147.124.105 - - [03/Feb/2023:09:26:57 +0100] "POST /login HTTP/2.0" 500 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36"
/var/log/nginx/nextcloud-error.log:
2023/02/03 09:26:31 [error] 29962#29962: *10524 FastCGI sent in stderr: "PHP message: PHP Fatal error: Declaration of OCA\Deck\Db\RelationalEntity::markFieldUpdated($attribute) must be compatible with OCP\AppFramework\Db\Entity::markFieldUpdated(string $attribute): void in /var/www/nextcloud/apps/deck/lib/Db/RelationalEntity.php on line 56" while reading response header from upstream, client: 80.147.124.105, server: cloud.example.com, request: "POST /login HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.1-fpm.sock:", host: "cloud.example.com"
2023/02/03 09:26:57 [error] 29962#29962: *10524 FastCGI sent in stderr: "PHP message: PHP Fatal error: Declaration of OCA\Deck\Db\RelationalEntity::markFieldUpdated($attribute) must be compatible with OCP\AppFramework\Db\Entity::markFieldUpdated(string $attribute): void in /var/www/nextcloud/apps/deck/lib/Db/RelationalEntity.php on line 56" while reading response header from upstream, client: 80.147.124.105, server: cloud.example.com, request: "POST /login HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.1-fpm.sock:", host: "cloud.example.com"
Same error is thrown when trying to upgrade manually to next beta release from the command line:
sudo -u www-data php8.1 occ upgrade
PHP Fatal error: Declaration of OCA\Deck\Db\RelationalEntity::markFieldUpdated($attribute) must be compatible with OCP\AppFramework\Db\Entity::markFieldUpdated(string $attribute): void in /var/www/nextcloud/apps/deck/lib/Db/RelationalEntity.php on line 56
Or any other manual invocation of the occ tool.
Any hints on how to solve that?
thanks for testing the beta!