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Or for longer, use three backticks above and below the code snippet:
longer
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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): replace me
Operating system and version (eg, Ubuntu 20.04): replace me
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 7.4): replace me
The issue you are facing:
{“reqId”:“ypgVelLgQBGfEGc2Vo18”,“level”:3,“time”:“2023-09-12T03:31:02+00:00”,“remoteAddr”:“192.168.43.111”,“user”:“–”,“app”:“no app in context”,“method”:“GET”,“url”:“/login?redirect_url=/apps/files/?dir%3D/%26fileid%3D496”,“message”:{“Exception”:“Symfony\Component\Routing\Exception\RouteNotFoundException”,“Message”:“Unable to generate a URL for the named route "theming.Theming.getJavascript" as such route does not exist.”,“Code”:0,“Trace”:[{“file”:“/var/www/html/lib/private/Route/Router.php”,“line”:338,“function”:“generate”,“class”:“Symfony\Component\Routing\Generator\UrlGenerator”,“type”:“->”,“args”:[“theming.Theming.getJavascript”,{“v”:“0”},1]},{“file”:“/var/www/html/lib/private/Route/CachingRouter.php”,“line”:60,“function”:“generate”,“class”:“OC\Route\Router”,“type”:“->”,“args”:[“theming.Theming.getJavascript”,{“v”:“0”},false]},{“file”:“/var/www/html/lib/private/URLGenerator.php”,“line”:83,“function”:“generate”,“class”:“OC\Route\CachingRouter”,“type”:“->”,“args”:[“theming.Theming.getJavascript”,{“v”:“0”}]},{“file”:“/var/www/html/apps/theming/appinfo/app.php”,“line”:52,“function”:“linkToRoute”,“class”:“OC\URLGenerator”,“type”:“->”,“args”:[“theming.Theming.getJavascript”,{“v”:“0”}]},{“file”:“/var/www/html/lib/private/legacy/OC_App.php”,“line”:266,“args”:[“/var/www/html/apps/theming/appinfo/app.php”],“function”:“require_once”},{“file”:“/var/www/html/lib/private/legacy/OC_App.php”,“line”:155,“function”:“requireAppFile”,“class”:“OC_App”,“type”:“::”,“args”:[{“class”:“OCA\Theming\AppInfo\Application”}]},{“file”:“/var/www/html/lib/private/legacy/OC_Template.php”,“line”:287,“function”:“loadApp”,“class”:“OC_App”,“type”:“::”,“args”:[“theming”]},{“file”:“/var/www/html/index.php”,“line”:45,“function”:“printErrorPage”,“class”:“OC_Template”,“type”:“::”,“args”:[“Can’t write into config directory!”,“This can usually be fixed by giving the webserver write access to the config directory.”,503]}],“File”:“/var/www/html/3rdparty/symfony/routing/Generator/UrlGenerator.php”,“Line”:143,“CustomMessage”:“–”},“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36”,“version”:“”}
^C
root@3f1b3a447ceb:/var/www/htm
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE