owncloud repair fails with Error ‘SabreHTTPURLUtil’ not found

What can I do to rescue my owncloud server installation?

I ran an update to an owncloud server to 10.0.3. Because files, contacts, tasks and calendar did not show up I end up trying a

sudo -u www-data php /var/www/owncloud/occ maintenance:repair

However, I get an unhandled Exception. Log:

- Step: Repair mime types
 - Step: Detect file cache entries with path that does not match parent-child relationships
 - Step: Generate ETags for file where no ETag is present.
     - INFO: ETags have been fixed for 0 files/folders.
 - Step: Clean tags and favorites
     - INFO: 0 tags of deleted users have been removed.
     - INFO: 0 tags for delete files have been removed.
     - INFO: 0 tag entries for deleted tags have been removed.
     - INFO: 0 tags with no entries have been removed.
 - Step: Drop old database tables

 - Step: Drop old background jobs
 - Step: Remove getetag entries in properties table
     - INFO: Removed 0 unneeded "{DAV:}getetag" entries from properties table.
 - Step: Repair invalid shares
 - Step: Repair sub shares
 - Step: Remove old share propagation app entries
 - Step: Move user avatars outside the homes to the new location
     - INFO: No action required
 - Step: Fix user avatars location
     - INFO: No action required
 - Step: Remove shares of a users root folder
 - Step: Repair unmerged shares
 - Step: Disable extra themes
 - Step: Remove invalid calendar and addressbook shares
An unhandled exception has been thrown:
Error: Class 'SabreHTTPURLUtil' not found in /var/www/owncloud/apps/dav/lib/Connector/Sabre/Principal.php:103
Stack trace:
#0 /var/www/owncloud/apps/dav/lib/Repair/RemoveInvalidShares.php(87): OCADAVConnectorSabrePrincipal->getPrincipalByPath('principals/grou...')
#1 /var/www/owncloud/lib/private/Repair.php(90): OCADAVRepairRemoveInvalidShares->run(Object(OCRepair))
#2 /var/www/owncloud/core/Command/Maintenance/Repair.php(157): OCRepair->run()
#3 /var/www/owncloud/lib/composer/symfony/console/Command/Command.php(255): OCCoreCommandMaintenanceRepair->execute(Object(SymfonyComponentConsoleInputArgvInput), Object(SymfonyComponentConsoleOutputConsoleOutput))
#4 /var/www/owncloud/lib/composer/symfony/console/Application.php(982): SymfonyComponentConsoleCommandCommand->run(Object(SymfonyComponentConsoleInputArgvInput), Object(SymfonyComponentConsoleOutputConsoleOutput))
#5 /var/www/owncloud/lib/composer/symfony/console/Application.php(255): SymfonyComponentConsoleApplication->doRunCommand(Object(OCCoreCommandMaintenanceRepair), Object(SymfonyComponentConsoleInputArgvInput), Object(SymfonyComponentConsoleOutputConsoleOutput))
#6 /var/www/owncloud/lib/composer/symfony/console/Application.php(148): SymfonyComponentConsoleApplication->doRun(Object(SymfonyComponentConsoleInputArgvInput), Object(SymfonyComponentConsoleOutputConsoleOutput))
#7 /var/www/owncloud/lib/private/Console/Application.php(165): SymfonyComponentConsoleApplication->run(Object(SymfonyComponentConsoleInputArgvInput), Object(SymfonyComponentConsoleOutputConsoleOutput))
#8 /var/www/owncloud/console.php(106): OCConsoleApplication->run()
#9 /var/www/owncloud/occ(11): require_once('/var/www/ownclo...')
#10 {main}