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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): 22.0.0 from http://digital.box.free.fr/dsm7/
Operating system and version (eg, Ubuntu 20.04): DSM7
Apache or nginx version (eg, Apache 2.4.25): 2.4
PHP version (eg, 7.4): 7.4
The issue you are facing:
I can’t access to my files or my mail
Is this the first time you’ve seen this error? (Y/N): there is 3 weeks
Steps to replicate it:
- go to files app since i try upgrade Nextcloud in Nexcloud interface not un synology graphical package manager with error.)
- this message appears : “Ce répertoire est indisponible, merci de consulter les journaux ou de contacter votre administrateur”
-
sudo -u sc-nextcloud cat data/nextcloud.log | grep errorreturn
The output of your Nextcloud log in Admin > Logging:
{"reqId":" ","level":3,"time":"2021-11-06T11:45:04+00:00","remoteAddr":"192.168.1.254","user":"myName","app":"index","method":"GET","url":"/webstation_error_page_custom_default_403","message":"The requested uri(/webstation_error_page_custom_default_403) cannot be processed by the script '/nextcloud/index.php')","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36","version":"22.0.0.11","exception":{"Exception":"Exception","Message":"The requested uri(/webstation_error_page_custom_default_403) cannot be processed by the script '/nextcloud/index.php')","Code":0,"Trace":[{"file":"/volume1/web_packages/nextcloud/lib/base.php","line":944,"function":"getRawPathInfo","class":"OC\\AppFramework\\Http\\Request","type":"->","args":[]},{"file":"/volume1/web_packages/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/volume1/web_packages/nextcloud/lib/private/AppFramework/Http/Request.php","Line":770,"CustomMessage":"--"}}
- I have this in nextcloud config page
Il y a quelques avertissements concernant votre configuration.
The reverse proxy header configuration is incorrect, or you are accessing Nextcloud from a trusted proxy. If not, this is a security issue and can allow an attacker to spoof their IP address as visible to the Nextcloud. Further information can be found in the documentation ↗.
L'en-tête HTTP "Strict-Transport-Security" n'est pas configuré à au moins "15552000" secondes. Pour une sécurité renforcée, il est recommandé d'activer HSTS comme indiqué dans les éléments de sécurité ↗.
Votre serveur web nest pas configuré correctement pour résoudre "/.well-known/webfinger". Plus d'informations peuvent être trouvées sur notre documentation.
Votre serveur web nest pas configuré correctement pour résoudre "/.well-known/nodeinfo". Plus d'informations peuvent être trouvées sur notre documentation.
Votre serveur web nest pas configuré correctement pour résoudre "/.well-known/caldav". Plus d'informations peuvent être trouvées sur notre documentation.
Votre serveur web nest pas configuré correctement pour résoudre "/.well-known/carddav". Plus d'informations peuvent être trouvées sur notre documentation.
Votre installation n’a pas de préfixe de région par défaut. C’est nécessaire pour valider les numéros de téléphone dans les paramètres du profil sans code pays. Pour autoriser les numéros sans code pays, veuillez ajouter "default_phone_region" avec le code ISO 3166-1 respectif de la région dans votre fichier de configuration.
No memory cache has been configured. To enhance performance, please configure a memcache, if available. Further information can be found in the documentation ↗.
Merci de consulter les guides d'installation ↗ et de vérifier les erreurs ou avertissements des logs.
Vérifier la sécurité de votre Nextcloud grâce à notre scan de sécurité ↗
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 => '176.170.xxx.xxx',
1 => ' .synology.me',
),
'trusted_proxies' =>
array (
0 => '192.168.1.254',
),
'forwarded_for_headers' =>
array (
0 => 'HTTP_X_FORWARDED_FOR',
),
'datadirectory' => '/volume1/web_packages/nextcloud/data',
'dbtype' => 'pgsql',
'version' => '22.0.0.11',
'overwrite.cli.url' => 'https:// .synology.me/nextcloud/',
'dbname' => 'nextcloud',
'dbhost' => '127.0.0.1:5433',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_',
'dbpassword' => '',
'installed' => true,
'maintenance' => false,
'updater.secret' => '',
);
The output of your Apache/nginx/system log in /var/log/____:
https://termbin.com/p9zu