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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
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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): 21.0.9
Operating system and version (eg, Ubuntu 20.04): buntu 20.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.41
PHP version (eg, 7.4): 7.4.3
The issue you are facing:
Upgrade goes till the end and once done, on first attempt, NC reports issue as internal server error with ID. Grepping log by this ID gives me:
{"reqId":"VKYBlW2yVUe1rksCiXma","level":3,"time":"2022-03-28 03:58:11","remoteAddr":"172.16.0.1","user":"Px2","app":"index","method":"GET","url":"/owncloud/index.php/apps/files/","message":{"Exception":"Exception","Message":"Undefined class constant 'MAJOR_VERSION'","Code":0,"Trace":[{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":157,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":303,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/lib/base.php","line":993,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","Line":159,"Previous":{"Exception":"Error","Message":"Undefined class constant 'MAJOR_VERSION'","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/functions.php","line":71,"function":"defaultUserAgent","class":"GuzzleHttp\\Utils","type":"::"},{"file":"/var/www/nextcloud/apps/files_external_dropbox/vendor/guzzlehttp/guzzle/src/Client.php","line":194,"function":"GuzzleHttp\\default_user_agent"},{"file":"/var/www/nextcloud/apps/files_external_dropbox/vendor/guzzlehttp/guzzle/src/Client.php","line":75,"function":"configureDefaults","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/nextcloud/lib/private/Http/Client/ClientService.php","line":62,"function":"__construct","class":"GuzzleHttp\\Client","type":"->"},{"file":"/var/www/nextcloud/lib/private/OCS/DiscoveryService.php","line":55,"function":"newClient","class":"OC\\Http\\Client\\ClientService","type":"->"},{"file":"/var/www/nextcloud/lib/private/Server.php","line":1283,"function":"__construct","class":"OC\\OCS\\DiscoveryService","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php","line":118,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":122,"function":"offsetGet","class":"Pimple\\Container","type":"->"},{"file":"/var/www/nextcloud/lib/private/ServerContainer.php","line":137,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":434,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":87,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"array_map"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":459,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":431,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":87,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"array_map"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":459,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":431,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":87,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":101,"function":"array_map"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":109,"function":"buildClass","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":459,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/ServerContainer.php","line":146,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/EventDispatcher/ServiceEventListener.php","line":67,"function":"query","class":"OC\\ServerContainer","type":"->"},{"file":"/var/www/nextcloud/3rdparty/symfony/event-dispatcher/EventDispatcher.php","line":251,"function":"__invoke","class":"OC\\EventDispatcher\\ServiceEventListener","type":"->"},{"file":"/var/www/nextcloud/3rdparty/symfony/event-dispatcher/EventDispatcher.php","line":73,"function":"callListeners","class":"Symfony\\Component\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/EventDispatcher/EventDispatcher.php","line":86,"function":"dispatch","class":"Symfony\\Component\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/EventDispatcher/EventDispatcher.php","line":98,"function":"dispatch","class":"OC\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/var/www/nextcloud/apps/files_sharing/list.php","line":48,"function":"dispatchTyped","class":"OC\\EventDispatcher\\EventDispatcher","type":"->"},{"file":"/var/www/nextcloud/apps/files/lib/Controller/ViewController.php","line":130,"args":["/var/www/nextcloud/apps/files_sharing/list.php"],"function":"include"},{"file":"/var/www/nextcloud/apps/files/lib/Controller/ViewController.php","line":269,"function":"renderScript","class":"OCA\\Files\\Controller\\ViewController","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":218,"function":"index","class":"OCA\\Files\\Controller\\ViewController","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":127,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":157,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":303,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/lib/base.php","line":993,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/3rdparty/guzzlehttp/guzzle/src/Utils.php","Line":118},"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0","version":"21.0.9.1"}
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Upgrade to 21.0.9
- Try to access
The output of your Apache/nginx/system log in /var/log/____:
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/index.php/apps/files/ HTTP/1.1" 500 10619 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/core/js/dist/files_fileinfo.js?v=8dac5161-3 HTTP/1.1" 200 9586 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/accessibility/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 2324 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/accessibility/js/accessibilityoca.js?v=8dac5161-3 HTTP/1.1" 200 4728 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/drawio/js/main.js?v=8dac5161-3 HTTP/1.1" 200 3328 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/core/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 22721 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/drawio/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 1965 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/core/js/dist/files_client.js?v=8dac5161-3 HTTP/1.1" 200 43091 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files_sharing/js/dist/main.js?v=8dac5161-3 HTTP/1.1" 200 1219 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files_sharing/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 6360 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files_videoplayer/js/main.js?v=8dac5161-3 HTTP/1.1" 200 3612 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/notifications/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 2190 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 5696 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files_sharing/js/dist/collaboration.js?v=8dac5161-3 HTTP/1.1" 200 1383 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/socialsharing_email/js/socialsharingemail.js?v=8dac5161-3 HTTP/1.1" 200 1319 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/socialsharing_facebook/js/socialsharingfacebook.js?v=8dac5161-3 HTTP/1.1" 200 1313 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/socialsharing_twitter/js/socialsharingtwitter.js?v=8dac5161-3 HTTP/1.1" 200 1315 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files_texteditor/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 2274 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files/js/dist/main.js?v=8dac5161-3 HTTP/1.1" 200 170237 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/notifications/js/notifications-main.js?v=8dac5161-3 HTTP/1.1" 200 298029 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/files_texteditor/build/editor.js?v=8dac5161-3 HTTP/1.1" 200 17385 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/core/js/dist/main.js?v=8dac5161-3 HTTP/1.1" 200 467035 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/core/js/dist/systemtags.js?v=8dac5161-3 HTTP/1.1" 200 19234 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/maps/js/filetypes.js?v=8dac5161-3 HTTP/1.1" 302 1291 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/maps/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 6883 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/systemtags/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 2292 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/systemtags/js/systemtags.js?v=8dac5161-3 HTTP/1.1" 200 6086 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/comments/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 1733 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/comments/js/comments.js?v=8dac5161-3 HTTP/1.1" 200 3759 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/contacts/l10n/pl.js?v=8dac5161-3 HTTP/1.1" 200 6793 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/apps/contacts/js/contacts-files-action.js?v=8dac5161-3 HTTP/1.1" 200 25268 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:13 +1300] "GET /owncloud/index.php/apps/files/ HTTP/1.1" 500 10619 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/index.php/apps/systemtags/lastused HTTP/1.1" 412 828 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/index.php/apps/drawio/ajax/settings HTTP/1.1" 200 907 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 959 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/index.php/apps/files/undefined/img/notifications.svg HTTP/1.1" 302 968 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/index.php/apps/photos/service-worker.js HTTP/1.1" 200 5985 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/index.php/apps/files/undefined/img/notifications.svg HTTP/1.1" 302 968 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/index.php/apps/files/ HTTP/1.1" 500 10619 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
172.16.0.1 - - [28/Mar/2022:17:16:14 +1300] "GET /owncloud/index.php/apps/files/ HTTP/1.1" 500 10619 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0"
I run this on ZFS so rolled all back to old stuff. If there is anything you think might be helpful I can share from old/current installation.
