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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, 25.0.1): 27.0.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.3
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.52
PHP version (eg, 7.4): 8.2.8
The issue you are facing:
After updating the mail app i get an error when i click the mail icon in the upper app bar. I deactivated, deleted and installed it again but the error is still there.
Is this the first time you’ve seen this error? (Y/N):
Yes
Steps to replicate it:
- Try to open the mail app
The output of your Nextcloud log in Admin > Logging:
BadFunctionCallException: quotaPercentage is not a valid attribute
/var/www/nextcloud/lib/public/AppFramework/Db/Entity.php - line 167:
OCP\AppFramework\Db\Entity->setter()
/var/www/nextcloud/lib/public/AppFramework/Db/Entity.php - line 75:
OCP\AppFramework\Db\Entity->__call()
/var/www/nextcloud/lib/public/AppFramework/Db/QBMapper.php - line 321:
OCP\AppFramework\Db\Entity::fromRow()
/var/www/nextcloud/lib/public/AppFramework/Db/QBMapper.php - line 339:
OCP\AppFramework\Db\QBMapper->mapRowToEntity()
/var/www/nextcloud/apps/mail/lib/Db/MailAccountMapper.php - line 97:
OCP\AppFramework\Db\QBMapper->findEntities()
/var/www/nextcloud/apps/mail/lib/Service/AccountService.php - line 72:
OCA\Mail\Db\MailAccountMapper->findByUserId()
/var/www/nextcloud/apps/mail/lib/Controller/PageController.php - line 134:
OCA\Mail\Service\AccountService->findByUserId()
/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 230:
OCA\Mail\Controller\PageController->index()
/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 137:
OC\AppFramework\Http\Dispatcher->executeController()
/var/www/nextcloud/lib/private/AppFramework/App.php - line 183:
OC\AppFramework\Http\Dispatcher->dispatch()
/var/www/nextcloud/lib/private/Route/Router.php - line 315:
OC\AppFramework\App::main()
/var/www/nextcloud/lib/base.php - line 1071:
OC\Route\Router->match()
/var/www/nextcloud/index.php - line 36:
OC::handleRequest()
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 (
1 => '',
2 => '',
3 => '',
4 => '',
5 => '',
6 => '',
7 => '',
8 => '',
0 => 'localhost:90',
),
'datadirectory' => '/media/WDRed/Nextcloud/data',
'overwrite.cli.url' => 'http://localhost:90',
'dbtype' => 'mysql',
'version' => '27.0.2.1',
'dbname' => 'owncloud',
'dbhost' => 'localhost:90',
'dbtableprefix' => 'oc_',
'dbuser' => 'xxx',
'dbpassword' => 'xxx',
'logtimezone' => 'UTC',
'installed' => true,
'mail_domain' => 'xxx.de',
'mail_smtpmode' => 'smtp',
'mail_from_address' => 'info',
'maintenance' => false,
'debug' => false,
'theme' => '',
'logfile' => '/var/log/nextcloud.log',
'loglevel' => 0,
'default_phone_region' => 'DE',
'mail_smtpauthtype' => 'LOGIN',
'trashbin_retention_obligation' => '30, 60',
'mail_smtpauth' => 1,
'mail_smtpsecure' => 'ssl',
'mail_smtphost' => 'smtp.xxx.de',
'mail_smtpport' => '123',
'mail_smtpname' => x@xxx.de',
'mail_smtppassword' => 'xxx',
'mail_smtptimeout' => 30,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.locking' => '\\OC\\Memcache\\APCu',
'mail_sendmailmode' => 'smtp',
'mysql.utf8mb4' => true,
'app_install_overwrite' =>
array (
0 => 'weather',
1 => 'social',
2 => 'piwik',
3 => 'files_retention',
4 => 'onlyoffice',
5 => 'music',
6 => 'talk_matterbridge',
7 => 'bruteforcesettings',
8 => 'occweb',
9 => 'unsplash',
10 => 'twofactor_nextcloud_notification',
11 => 'previewgenerator',
12 => 'documentserver_community',
13 => 'maps',
),
'filelocking.enabled' => true,
'filelocking.ttl' => 18000,
'simpleSignUpLink.shown' => false,
'enable_previews' => true,
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\TXT',
1 => 'OC\\Preview\\Movie',
2 => 'OC\\Preview\\MP4',
3 => 'OC\\Preview\\MKV',
4 => 'OC\\Preview\\AVI',
5 => 'OC\\Preview\\Image',
),
'updater.release.channel' => 'stable',
'updater.secret' => 'xxx',
);
I hopefully learned my lesson but maybe there is a solution for my fault like updating to the corresponding mail app alpha/beta and than wait for the stable or something like that?
)…