[Bug]: Setting locale failed.

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Steps to reproduce

1. I'm using daily update package, but suddenly shows me this error scrren.
   https://download.nextcloud.com/server/daily/nextcloud-master-daily-2026-07-08.zip
2. I'd installed all the locales files, locales-all and generated the language files.
3. update to nextcloud-master-daily-2026-07-11.zip, but still had this error screen.

Expected behavior

Can be used normally.

Nextcloud Server version

35 (master)

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Apache (supported)

Database engine version

MySQL

Is this bug present after an update or on a fresh install?

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "REMOVED SENSITIVE VALUE",
            "REMOVED SENSITIVE VALUE"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "35.0.0.1",
        "overwriteprotocol": "https",
        "overwrite.cli.url": "https:\/\/cloud.amazehome.cn",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "updater.release.channel": "daily",
        "installed": true,
        "default_language": "zh_CN",
        "default_locale": "zh_CN",
        "theme": "",
        "post_max_size": "2G",
        "upload_max_filesize": "2G",
        "loglevel": 0,
        "maintenance": false,
        "chunked_upload_enabled": true,
        "chunk_size": 10485760,
        "default_phone_region": "CN",
        "filelocking.enabled": "true",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379,
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "memcache.distributed": "\\OC\\Memcache\\Memcached",
        "memcached_servers": [
            [
                "x.x.x.x",
                11211
            ]
        ],
        "maintenance_window_start": 1,
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": true,
        "mail_smtpport": "587",
        "mail_sendmailmode": "smtp",
        "mail_smtpstreamoptions": {
            "ssl": {
                "allow_self_signed": true,
                "verify_peer": false,
                "verify_peer_name": false
            }
        },
        "forbidden_filename_basenames": [
            "con",
            "prn",
            "aux",
            "nul",
            "com0",
            "com1",
            "com2",
            "com3",
            "com4",
            "com5",
            "com6",
            "com7",
            "com8",
            "com9",
            "com\u00b9",
            "com\u00b2",
            "com\u00b3",
            "lpt0",
            "lpt1",
            "lpt2",
            "lpt3",
            "lpt4",
            "lpt5",
            "lpt6",
            "lpt7",
            "lpt8",
            "lpt9",
            "lpt\u00b9",
            "lpt\u00b2",
            "lpt\u00b3"
        ],
        "forbidden_filename_characters": [
            "<",
            ">",
            ":",
            "\"",
            "|",
            "?",
            "*",
            "\\",
            "\/"
        ],
        "forbidden_filename_extensions": [
            " ",
            ".",
            ".filepart",
            ".part"
        ],
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "defaultapp": "dashboard,activity,files,spreed,forms",
        "app_install_overwrite": [
            "spreed",
            "call_summary_bot",
            "forms",
            "integration_openai",
            "onlyoffice",
            "notify_push",
            "quota_warning",
            "duplicatefinder"
        ]
    }
}

List of activated Apps

Enabled:
  - admin_audit: 2.0.0-dev.0
  - app_api: 35.0.0-dev.1
  - appstore: 2.0.0-dev.0
  - bruteforcesettings: 8.0.0-dev.0
  - call_summary_bot: 3.4.0
  - circles: 35.0.0-dev.0
  - cloud_federation_api: 2.0.0-dev.0
  - comments: 2.0.0-dev.0
  - contactsinteraction: 2.0.0-dev.0
  - dashboard: 8.0.0-dev.0
  - dav: 2.0.0-dev.0
  - duplicatefinder: 1.8.1
  - federatedfilesharing: 2.0.0-dev.1
  - federation: 2.0.0-dev.0
  - files: 3.0.0-dev.0
  - files_downloadlimit: 5.3.0-dev.0
  - files_external: 2.0.0-dev.0
  - files_lock: 35.0.0-dev.0
  - files_pdfviewer: 8.0.0-dev.0
  - files_reminders: 2.0.0-dev.0
  - files_sharing: 2.0.0-dev.1
  - files_trashbin: 2.0.0-dev.0
  - files_versions: 2.0.0-dev.0
  - firstrunwizard: 8.0.0-dev.0
  - forms: 5.3.2
  - integration_openai: 4.5.1
  - logreader: 8.0.0-dev.0
  - lookup_server_connector: 2.0.0-dev.0
  - nextcloud_announcements: 7.0.0-dev.0
  - notifications: 8.0.0-dev.0
  - notify_push: 1.3.3
  - oauth2: 2.0.0-dev.0
  - office: 1.0.0
  - onlyoffice: 10.1.2
  - privacy: 7.0.0-dev.0
  - profile: 2.0.0-dev.0
  - provisioning_api: 2.0.0-dev.0
  - quota_warning: 1.24.0
  - recommendations: 8.0.0-dev.0
  - related_resources: 6.0.0-dev.0
  - serverinfo: 7.0.0-dev.0
  - settings: 2.0.0-dev.0
  - sharebymail: 2.0.0-dev.0
  - sociallogin: 6.5.2
  - spreed: 24.0.2
  - support: 7.0.0-dev.0
  - survey_client: 7.0.0-dev.0
  - systemtags: 2.0.0-dev.0
  - text: 9.0.0-dev.0
  - theming: 3.0.0-dev.0
  - twofactor_backupcodes: 2.0.0-dev.0
  - twofactor_nextcloud_notification: 9.0.0-dev.0
  - twofactor_totp: 17.1.0
  - updatenotification: 2.0.0-dev.0
  - user_status: 2.0.0-dev.0
  - viewer: 8.0.0-dev.0
  - weather_status: 2.0.0-dev.0
  - webhook_listeners: 2.0.0-dev.0
  - workflowengine: 3.0.0-dev.0
Disabled:
  - activity: 8.0.0-dev.0 (installed 8.0.0-dev.0)
  - encryption: 3.0.0-dev.0
  - password_policy: 7.0.0-dev.0 (installed 1.18.0)
  - photos: 8.0.0-dev.0 (installed 8.0.0-dev.0)
  - suspicious_login: 13.0.0-dev.0
  - user_ldap: 2.0.0-dev.0 (installed 1.21.0)

Nextcloud Signing status

none

Nextcloud Logs

{"reqId":"HUFCXVoDWzVCNhEWJCXU","level":1,"time":"2026-07-11T23:57:06+00:00","remoteAddr":"x.x.x.x","user":"--","app":"no app in context","method":"GET","url":"/cron.php","scriptName":"/cron.php","message":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist.","userAgent":"curl/8.17.0","version":"35.0.0.1","exception":{"Exception":"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException","Message":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist.","Code":0,"Trace":[{"file":"/var/www/html/lib/private/Route/Router.php","line":416,"function":"generate","class":"Symfony\\Component\\Routing\\Generator\\UrlGenerator","type":"->"},{"file":"/var/www/html/lib/private/URLGenerator.php","line":67,"function":"generate","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":254,"function":"linkToRoute","class":"OC\\URLGenerator","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":362,"function":"resolveAppNavigationEntries","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":322,"function":"getDefaultEntryIds","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":94,"function":"getDefaultEntryIdForUser","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":90,"function":"updateDefaultEntries","class":"OC\\NavigationManager","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/lib/private/NavigationManager.php","line":277,"function":"add","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":104,"function":"resolveAppNavigationEntries","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/apps/theming/lib/ThemingDefaults.php","line":153,"function":"getAll","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/lib/private/legacy/OC_Defaults.php","line":248,"function":"getShortFooter","class":"OCA\\Theming\\ThemingDefaults","type":"->"},{"file":"/var/www/html/lib/public/Defaults.php","line":153,"function":"getLongFooter","class":"OC_Defaults","type":"->"},{"file":"/var/www/html/core/templates/layout.guest.php","line":61,"function":"getLongFooter","class":"OCP\\Defaults","type":"->"},{"file":"/var/www/html/lib/private/Template/Base.php","line":133,"args":["/var/www/html/core/templates/layout.guest.php"],"function":"include"},{"file":"/var/www/html/lib/private/Template/Base.php","line":106,"function":"load","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/private/Template/Template.php","line":113,"function":"fetchPage","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/private/Template/Template.php","line":143,"function":"fetchPage","class":"OC\\Template\\Template","type":"->"},{"file":"/var/www/html/lib/private/Template/Base.php","line":96,"function":"fetchPage","class":"OC\\Template\\Template","type":"->"},{"file":"/var/www/html/lib/private/Template/TemplateManager.php","line":52,"function":"printPage","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/OC.php","line":821,"function":"printGuestPage","class":"OC\\Template\\TemplateManager","type":"->"},{"file":"/var/www/html/lib/base.php","line":12,"function":"init","class":"OC","type":"::"},{"file":"/var/www/html/cron.php","line":18,"args":["/var/www/html/lib/base.php"],"function":"require_once"}],"File":"/var/www/html/3rdparty/symfony/routing/Generator/UrlGenerator.php","Line":134,"message":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist.","exception":"{\"class\":\"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException\",\"message\":\"Unable to generate a URL for the named route \\\"files.view.index\\\" as such route does not exist.\",\"code\":0,\"file\":\"/var/www/html/3rdparty/symfony/routing/Generator/UrlGenerator.php:134\",\"trace\":\"#0 /var/www/html/lib/private/Route/Router.php(416): Symfony\\Component\\Routing\\Generator\\UrlGenerator->generate()\\n#1 /var/www/html/lib/private/URLGenerator.php(67): OC\\Route\\Router->generate()\\n#2 /var/www/html/lib/private/NavigationManager.php(254): OC\\URLGenerator->linkToRoute()\\n#3 /var/www/html/lib/private/NavigationManager.php(362): OC\\NavigationManager->resolveAppNavigationEntries()\\n#4 /var/www/html/lib/private/NavigationManager.php(322): OC\\NavigationManager->getDefaultEntryIds()\\n#5 /var/www/html/lib/private/NavigationManager.php(94): OC\\NavigationManager->getDefaultEntryIdForUser()\\n#6 /var/www/html/lib/private/NavigationManager.php(90): OC\\NavigationManager->updateDefaultEntries()\\n#7 /var/www/html/lib/private/NavigationManager.php(277): OC\\NavigationManager->add()\\n#8 /var/www/html/lib/private/NavigationManager.php(104): OC\\NavigationManager->resolveAppNavigationEntries()\\n#9 /var/www/html/apps/theming/lib/ThemingDefaults.php(153): OC\\NavigationManager->getAll()\\n#10 /var/www/html/lib/private/legacy/OC_Defaults.php(248): OCA\\Theming\\ThemingDefaults->getShortFooter()\\n#11 /var/www/html/lib/public/Defaults.php(153): OC_Defaults->getLongFooter()\\n#12 /var/www/html/core/templates/layout.guest.php(61): OCP\\Defaults->getLongFooter()\\n#13 /var/www/html/lib/private/Template/Base.php(133): include('...')\\n#14 /var/www/html/lib/private/Template/Base.php(106): OC\\Template\\Base->load()\\n#15 /var/www/html/lib/private/Template/Template.php(113): OC\\Template\\Base->fetchPage()\\n#16 /var/www/html/lib/private/Template/Template.php(143): OC\\Template\\Template->fetchPage()\\n#17 /var/www/html/lib/private/Template/Base.php(96): OC\\Template\\Template->fetchPage()\\n#18 /var/www/html/lib/private/Template/TemplateManager.php(52): OC\\Template\\Base->printPage()\\n#19 /var/www/html/lib/OC.php(821): OC\\Template\\TemplateManager->printGuestPage()\\n#20 /var/www/html/lib/base.php(12): OC::init()\\n#21 /var/www/html/cron.php(18): require_once('...')\\n#22 {main}\"}","CustomMessage":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist."}}
{"reqId":"HUFCXVoDWzVCNhEWJCXU","level":0,"time":"2026-07-11T23:57:06+00:00","remoteAddr":"x.x.x.x","user":"--","app":"no app in context","method":"GET","url":"/cron.php","scriptName":"/cron.php","message":"Missing or invalid navigation route for app files","userAgent":"curl/8.17.0","version":"35.0.0.1","data":{"entry":"{\"name\":\"Files\",\"route\":\"files.view.index\",\"order\":\"0\",\"type\":\"link\"}"}}
{"reqId":"HUFCXVoDWzVCNhEWJCXU","level":1,"time":"2026-07-11T23:57:06+00:00","remoteAddr":"x.x.x.x","user":"--","app":"no app in context","method":"GET","url":"/cron.php","scriptName":"/cron.php","message":"Unable to generate a URL for the named route \"duplicatefinder.page.index\" as such route does not exist.","userAgent":"curl/8.17.0","version":"35.0.0.1","exception":{"Exception":"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException","Message":"Unable to generate a URL for the named route \"duplicatefinder.page.index\" as such route does not exist.","Code":0,"Trace":[{"file":"/var/www/html/lib/private/Route/Router.php","line":416,"function":"generate","class":"Symfony\\Component\\Routing\\Generator\\UrlGenerator","type":"->"},{"file":"/var/www/html/lib/private/URLGenerator.php","line":67,"function":"generate","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":254,"function":"linkToRoute","class":"OC\\URLGenerator","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":104,"function":"resolveAppNavigationEntries","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/apps/theming/lib/ThemingDefaults.php","line":153,"function":"getAll","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/lib/private/legacy/OC_Defaults.php","line":248,"function":"getShortFooter","class":"OCA\\Theming\\ThemingDefaults","type":"->"},{"file":"/var/www/html/lib/public/Defaults.php","line":153,"function":"getLongFooter","class":"OC_Defaults","type":"->"},{"file":"/var/www/html/core/templates/layout.guest.php","line":61,"function":"getLongFooter","class":"OCP\\Defaults","type":"->"},{"file":"/var/www/html/lib/private/Template/Base.php","line":133,"args":["/var/www/html/core/templates/layout.guest.php"],"function":"include"},{"file":"/var/www/html/lib/private/Template/Base.php","line":106,"function":"load","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/private/Template/Template.php","line":113,"function":"fetchPage","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/private/Template/Template.php","line":143,"function":"fetchPage","class":"OC\\Template\\Template","type":"->"},{"file":"/var/www/html/lib/private/Template/Base.php","line":96,"function":"fetchPage","class":"OC\\Template\\Template","type":"->"},{"file":"/var/www/html/lib/private/Template/TemplateManager.php","line":52,"function":"printPage","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/OC.php","line":821,"function":"printGuestPage","class":"OC\\Template\\TemplateManager","type":"->"},{"file":"/var/www/html/lib/base.php","line":12,"function":"init","class":"OC","type":"::"},{"file":"/var/www/html/cron.php","line":18,"args":["/var/www/html/lib/base.php"],"function":"require_once"}],"File":"/var/www/html/3rdparty/symfony/routing/Generator/UrlGenerator.php","Line":134,"message":"Unable to generate a URL for the named route \"duplicatefinder.page.index\" as such route does not exist.","exception":"{\"class\":\"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException\",\"message\":\"Unable to generate a URL for the named route \\\"duplicatefinder.page.index\\\" as such route does not exist.\",\"code\":0,\"file\":\"/var/www/html/3rdparty/symfony/routing/Generator/UrlGenerator.php:134\",\"trace\":\"#0 /var/www/html/lib/private/Route/Router.php(416): Symfony\\Component\\Routing\\Generator\\UrlGenerator->generate()\\n#1 /var/www/html/lib/private/URLGenerator.php(67): OC\\Route\\Router->generate()\\n#2 /var/www/html/lib/private/NavigationManager.php(254): OC\\URLGenerator->linkToRoute()\\n#3 /var/www/html/lib/private/NavigationManager.php(104): OC\\NavigationManager->resolveAppNavigationEntries()\\n#4 /var/www/html/apps/theming/lib/ThemingDefaults.php(153): OC\\NavigationManager->getAll()\\n#5 /var/www/html/lib/private/legacy/OC_Defaults.php(248): OCA\\Theming\\ThemingDefaults->getShortFooter()\\n#6 /var/www/html/lib/public/Defaults.php(153): OC_Defaults->getLongFooter()\\n#7 /var/www/html/core/templates/layout.guest.php(61): OCP\\Defaults->getLongFooter()\\n#8 /var/www/html/lib/private/Template/Base.php(133): include('...')\\n#9 /var/www/html/lib/private/Template/Base.php(106): OC\\Template\\Base->load()\\n#10 /var/www/html/lib/private/Template/Template.php(113): OC\\Template\\Base->fetchPage()\\n#11 /var/www/html/lib/private/Template/Template.php(143): OC\\Template\\Template->fetchPage()\\n#12 /var/www/html/lib/private/Template/Base.php(96): OC\\Template\\Template->fetchPage()\\n#13 /var/www/html/lib/private/Template/TemplateManager.php(52): OC\\Template\\Base->printPage()\\n#14 /var/www/html/lib/OC.php(821): OC\\Template\\TemplateManager->printGuestPage()\\n#15 /var/www/html/lib/base.php(12): OC::init()\\n#16 /var/www/html/cron.php(18): require_once('...')\\n#17 {main}\"}","CustomMessage":"Unable to generate a URL for the named route \"duplicatefinder.page.index\" as such route does not exist."}}
{"reqId":"HUFCXVoDWzVCNhEWJCXU","level":0,"time":"2026-07-11T23:57:06+00:00","remoteAddr":"x.x.x.x","user":"--","app":"no app in context","method":"GET","url":"/cron.php","scriptName":"/cron.php","message":"Missing or invalid navigation route for app duplicatefinder","userAgent":"curl/8.17.0","version":"35.0.0.1","data":{"entry":"{\"name\":\"Duplicate Finder\",\"route\":\"duplicatefinder.page.index\",\"type\":\"link\"}"}}
{"reqId":"HUFCXVoDWzVCNhEWJCXU","level":1,"time":"2026-07-11T23:57:06+00:00","remoteAddr":"x.x.x.x","user":"--","app":"no app in context","method":"GET","url":"/cron.php","scriptName":"/cron.php","message":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist.","userAgent":"curl/8.17.0","version":"35.0.0.1","exception":{"Exception":"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException","Message":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist.","Code":0,"Trace":[{"file":"/var/www/html/lib/private/Route/Router.php","line":416,"function":"generate","class":"Symfony\\Component\\Routing\\Generator\\UrlGenerator","type":"->"},{"file":"/var/www/html/lib/private/URLGenerator.php","line":67,"function":"generate","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":254,"function":"linkToRoute","class":"OC\\URLGenerator","type":"->"},{"file":"/var/www/html/lib/private/NavigationManager.php","line":104,"function":"resolveAppNavigationEntries","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/apps/theming/lib/ThemingDefaults.php","line":153,"function":"getAll","class":"OC\\NavigationManager","type":"->"},{"file":"/var/www/html/lib/private/legacy/OC_Defaults.php","line":248,"function":"getShortFooter","class":"OCA\\Theming\\ThemingDefaults","type":"->"},{"file":"/var/www/html/lib/public/Defaults.php","line":153,"function":"getLongFooter","class":"OC_Defaults","type":"->"},{"file":"/var/www/html/core/templates/layout.guest.php","line":61,"function":"getLongFooter","class":"OCP\\Defaults","type":"->"},{"file":"/var/www/html/lib/private/Template/Base.php","line":133,"args":["/var/www/html/core/templates/layout.guest.php"],"function":"include"},{"file":"/var/www/html/lib/private/Template/Base.php","line":106,"function":"load","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/private/Template/Template.php","line":113,"function":"fetchPage","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/private/Template/Template.php","line":143,"function":"fetchPage","class":"OC\\Template\\Template","type":"->"},{"file":"/var/www/html/lib/private/Template/Base.php","line":96,"function":"fetchPage","class":"OC\\Template\\Template","type":"->"},{"file":"/var/www/html/lib/private/Template/TemplateManager.php","line":52,"function":"printPage","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/html/lib/OC.php","line":821,"function":"printGuestPage","class":"OC\\Template\\TemplateManager","type":"->"},{"file":"/var/www/html/lib/base.php","line":12,"function":"init","class":"OC","type":"::"},{"file":"/var/www/html/cron.php","line":18,"args":["/var/www/html/lib/base.php"],"function":"require_once"}],"File":"/var/www/html/3rdparty/symfony/routing/Generator/UrlGenerator.php","Line":134,"message":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist.","exception":"{\"class\":\"Symfony\\Component\\Routing\\Exception\\RouteNotFoundException\",\"message\":\"Unable to generate a URL for the named route \\\"files.view.index\\\" as such route does not exist.\",\"code\":0,\"file\":\"/var/www/html/3rdparty/symfony/routing/Generator/UrlGenerator.php:134\",\"trace\":\"#0 /var/www/html/lib/private/Route/Router.php(416): Symfony\\Component\\Routing\\Generator\\UrlGenerator->generate()\\n#1 /var/www/html/lib/private/URLGenerator.php(67): OC\\Route\\Router->generate()\\n#2 /var/www/html/lib/private/NavigationManager.php(254): OC\\URLGenerator->linkToRoute()\\n#3 /var/www/html/lib/private/NavigationManager.php(104): OC\\NavigationManager->resolveAppNavigationEntries()\\n#4 /var/www/html/apps/theming/lib/ThemingDefaults.php(153): OC\\NavigationManager->getAll()\\n#5 /var/www/html/lib/private/legacy/OC_Defaults.php(248): OCA\\Theming\\ThemingDefaults->getShortFooter()\\n#6 /var/www/html/lib/public/Defaults.php(153): OC_Defaults->getLongFooter()\\n#7 /var/www/html/core/templates/layout.guest.php(61): OCP\\Defaults->getLongFooter()\\n#8 /var/www/html/lib/private/Template/Base.php(133): include('...')\\n#9 /var/www/html/lib/private/Template/Base.php(106): OC\\Template\\Base->load()\\n#10 /var/www/html/lib/private/Template/Template.php(113): OC\\Template\\Base->fetchPage()\\n#11 /var/www/html/lib/private/Template/Template.php(143): OC\\Template\\Template->fetchPage()\\n#12 /var/www/html/lib/private/Template/Base.php(96): OC\\Template\\Template->fetchPage()\\n#13 /var/www/html/lib/private/Template/TemplateManager.php(52): OC\\Template\\Base->printPage()\\n#14 /var/www/html/lib/OC.php(821): OC\\Template\\TemplateManager->printGuestPage()\\n#15 /var/www/html/lib/base.php(12): OC::init()\\n#16 /var/www/html/cron.php(18): require_once('...')\\n#17 {main}\"}","CustomMessage":"Unable to generate a URL for the named route \"files.view.index\" as such route does not exist."}}
{"reqId":"HUFCXVoDWzVCNhEWJCXU","level":0,"time":"2026-07-11T23:57:06+00:00","remoteAddr":"x.x.x.x","user":"--","app":"no app in context","method":"GET","url":"/cron.php","scriptName":"/cron.php","message":"Missing or invalid navigation route for app files","userAgent":"curl/8.17.0","version":"35.0.0.1","data":{"entry":"{\"name\":\"Files\",\"route\":\"files.view.index\",\"order\":\"0\",\"type\":\"link\"}"}}

Additional info

none

Start with the logged trace at lib/private/NavigationManager.php:254 and follow the route-generation path through lib/private/URLGenerator.php and lib/private/Route/Router.php. Check how apps/theming/lib/ThemingDefaults.php reaches the missing files.view.index route when the locale is set to zh_CN. Done means reproducing the locale-setting failure and no longer encountering this RouteNotFoundException.