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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): 21.0.0
Operating system and version (eg, Ubuntu 20.04): Arch Linux 5.11.11-hardened
Apache or nginx version (eg, Apache 2.4.25): nginx/1.18.0
PHP version (eg, 7.4): 8.0.3 with Zend OPcache v8.0.3
The issue you are facing:
Hello all, since i had upgraded the nextcloud to 21, i can access my files from davfs with no problem but i can’t acces to the webapp.
When i try to access i can only see the webupgrade page.
The occ command gives me - “Nextcloud or one of the apps require upgrade - only a limited number of commands are available
You may use your browser or the occ upgrade command to do the upgrade”.
i already tried to upgrade but i keep getting to the same page.
The output of your Nextcloud log in Admin > Logging:
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:03+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Repair::step: Repair step: Queue a one-time job to check for user uploaded certificates","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"20.0.7.1"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:03+00:00","remoteAddr":"******","user":"--","app":"no app in context","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"Deprecated event type for \\OC\\Repair::step: Symfony\\Component\\EventDispatcher\\GenericEvent is used","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"20.0.7.1"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:03+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Repair::step: Repair step: Repair DAV shares","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"20.0.7.1"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:03+00:00","remoteAddr":"******","user":"--","app":"no app in context","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"Deprecated event type for \\OC\\Repair::info: Symfony\\Component\\EventDispatcher\\GenericEvent is used","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"20.0.7.1"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:03+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Repair::info: Repair info: Repaired DAV group shares","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"20.0.7.1"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:03+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Updater::startCheckCodeIntegrity: Starting code integrity check...","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"20.0.7.1"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:47+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Updater::finishedCheckCodeIntegrity: Finished code integrity check","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"20.0.7.1"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:47+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Updater::updateEnd: Update successful","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"21.0.0.18"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:47+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Updater::maintenanceDisabled: Turned off maintenance mode","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"21.0.0.18"}
{"reqId":"il0P34vrClouGRWMlm4M","level":1,"time":"2021-04-07T10:03:47+00:00","remoteAddr":"******","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=W2L3Tb4Zo1unKW%2F64Ry46Iu%2BeKmvJmW7%2FNDtBOopnQY%3D%3AHlOxPu1x9THdcUSw0mrQjuH6Hs3KCSHRhpzUN6tZ8W8%3D","message":"\\OC\\Updater::resetLogLevel: Reset log level to Warning(2)","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0","version":"21.0.0.18"}
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 => '*******',
1 => '*******',
2 => '*******',
3 => '*******',
4 => '*******',
),
'datadirectory' => '/media',
'logfile' => '/var/log/nextcloud/nextcloud.log',
'apps_paths' =>
array (
0 =>
array (
'path' => '/usr/share/webapps/nextcloud/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/lib/nextcloud/apps',
'url' => '/wapps',
'writable' => true,
),
),
'dbtype' => 'mysql',
'version' => '20.0.7.1',
'overwrite.cli.url' => '*******',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => '*******',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'nextcloud',
'mail_domain' => '*******',
'mail_smtpport' => '465',
'mail_smtphost' => '******',
'mail_smtpauth' => 1,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpname' => '******',
'mail_smtppassword' => '******',
'memcache.local' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => 'true',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
'timeout' => 0.0,
),
'theme' => '',
'loglevel' => 0,
'debug' => false,
'maintenance' => true,
'appstoreenabled' => true,
'config_is_read_only' => false,
'upgrade.disable-web' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
Don't have errors in this log.