has someone managed to solve this problem?
Good question. No respons on Github either.
Same issue here with NC 19.0.1
Just updated nextcloud from 19.0.2 to 19.0.3 on ubuntu 20.04 server same issues since I updated :
Error no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route “tasks.page.index” as such route does not exist.
Error no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route “social.Navigation.navigate” as such route does not exist.
Error no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route “photos.page.index” as such route does not exist.
Error no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route “notes.page.index” as such route does not exist.
Error no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route “forms.page.index” as such route does not exist.
Error no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route “calendar.view.index” as such route does not exist.
Error jsresourceloader Could not find resource js/config.js to load
If anyone is using php fpm, restart the service and see if that helps.
My solution to the issue was (for some reason) to set the WebP image quality for the Nextcloud preview module to 30.
sudo -u www-data php /var/www/nextcloud/occ config:app:set preview webp_quality --value="30"