12:10:32 PHP Fatal error: Class 'FormatJson' not found in /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/includes/objectcache/HashBagOStuff.php on line 87
12:10:32 PHP Stack trace:
12:10:32 PHP 1. {main}() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/maintenance/update.php:0
12:10:32 PHP 2. require_once() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/maintenance/update.php:221
12:10:32 PHP 3. UpdateMediaWiki->execute() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/maintenance/doMaintenance.php:101
12:10:32 PHP 4. DatabaseUpdater->doUpdates() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/maintenance/update.php:177
12:10:32 PHP 5. DatabaseUpdater->runUpdates() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/includes/installer/DatabaseUpdater.php:408
12:10:32 PHP 6. call_user_func_array() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/includes/installer/DatabaseUpdater.php:443
12:10:32 PHP 7. Wikibase\SqlStore::rebuildPropertyInfo() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/includes/installer/DatabaseUpdater.php:0
12:10:32 PHP 8. AutoLoader::autoload() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/includes/AutoLoader.php:0
12:10:32 PHP 9. MWExceptionHandler::handleError() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/includes/exception/MWExceptionHandler.php:0
12:10:32 PHP 10. MWExceptionHandler::logError() /mnt/jenkins-workspace/workspace/mwext-Wikibase-repo-tests/includes/exception/MWExceptionHandler.php:217